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Monday, August 31, 2020

Grandfather clause

From Wikipedia, the free encyclopedia
 
A grandfather clause (or grandfather policy or grandfathering) is a provision in which an old rule continues to apply to some existing situations while a new rule will apply to all future cases. Those exempt from the new rule are said to have grandfather rights or acquired rights, or to have been grandfathered in. Frequently, the exemption is limited; it may extend for a set time, or it may be lost under certain circumstances. For example, a grandfathered power plant might be exempt from new, more restrictive pollution laws, but the exception may be revoked and the new rules would apply if the plant were expanded. Often, such a provision is used as a compromise or out of practicality, to allow new rules to be enacted without upsetting a well-established logistical or political situation. This extends the idea of a rule not being retroactively applied.

The term originated in late nineteenth-century legislation and constitutional amendments passed by a number of U.S. Southern states, which created new requirements for literacy tests, payment of poll taxes, and/or residency and property restrictions to register to vote. States in some cases exempted those whose ancestors (grandfathers) had the right to vote before the Civil War, or as of a particular date, from such requirements. The intent and effect of such rules was to prevent African-American former slaves and their descendants from voting, but without denying poor and illiterate whites the right to vote. Although these original grandfather clauses were eventually ruled unconstitutional, the terms grandfather clause and grandfather have been adapted to other uses.

Origin

The original grandfather clauses were contained in new state constitutions and Jim Crow laws passed between 1890 and 1908 by white-dominated state legislatures including Alabama, Georgia, Louisiana, North Carolina, Oklahoma, and Virginia. They restricted voter registration, effectively preventing African Americans from voting. Racial restrictions on voting in place before 1870 were nullified by the Fifteenth Amendment.

After Democrats took control of state legislatures again after the Compromise of 1877, they began to work to restrict the ability of blacks to vote. Paramilitary groups such as the White League, Red Shirts, and rifle clubs had intimidated blacks or barred them from the polls in numerous elections before what they called the Redemption (restoration of white supremacy). Nonetheless, a coalition of Populists and Republicans in fusion tickets in the 1880s and 1890s gained some seats and won some governor positions. To prevent such coalitions in the future, the Democrats wanted to exclude freedmen and other blacks from voting; in some states they also restricted poor whites to avoid biracial coalitions.

White Democrats developed statutes and passed new constitutions creating restrictive voter registration rules. Examples included imposition of poll taxes and residency and literacy tests. An exemption to such requirements was made for all persons allowed to vote before the American Civil War, and any of their descendants. The term grandfather clause arose from the fact that the laws tied the then-current generation's voting rights to those of their grandfathers. According to Black's Law Dictionary, some Southern states adopted constitutional provisions exempting from the literacy requirements descendants of those who fought in the army or navy of the United States or of the Confederate States during a time of war. 

After the U.S. Supreme Court found such provisions unconstitutional in Guinn v. United States (1915), states were forced to stop using the grandfather clauses to provide exemption to literacy tests. Without the grandfather clauses, tens of thousands of poor Southern whites were disenfranchised in the early 20th century. As decades passed, Southern states tended to expand the franchise for poor whites, but most blacks could not vote until after passage of the 1965 Voting Rights Act. Ratification in 1964 of the Twenty-fourth Amendment to the United States Constitution prohibited the use of poll taxes in federal elections, but some states continued to use them in state elections. 

The 1965 Voting Rights Act had provisions to protect voter registration and access to elections, with federal enforcement and supervision where necessary. In 1966, the Supreme Court ruled in Harper v. Virginia Board of Elections that poll taxes could not be used in any elections. This secured the franchise for most citizens, and voter registration and turnout climbed dramatically in Southern states.
There is also a rather different, older type of grandfather clause, perhaps more properly a grandfather principle in which a government blots out transactions of the recent past, usually those of a predecessor government. The modern analogue may be repudiating public debt, but the original was Henry II's principle, preserved in many of his judgments, "Let it be as it was on the day of my grandfather's death", a principle by which he repudiated all the royal grants that had been made in the previous 19 years under King Stephen.

Modern examples

Technology

  • Most cellular phone carriers including AT&T and Verizon had an unlimited data plan in the past, but these plans were removed. Customers who already had unlimited data plans could continue to have them for as long as they kept the same service. For new subscribers, the unlimited plan was no longer available and they had to select from a limited plan (usually 2–4 GB) with extra charges and fees for going over the limit.
  • Tablet computers (and similar devices) with screen sizes below eight inches which ran Windows 8 or Windows 8.1 featured a traditional Windows desktop with legacy app support, alongside the ability to run the newer Metro-style apps. However, newer devices with sub-8-inch screens that run the newly introduced Windows 10 operating system no longer have legacy app capability, and, as such, can only run apps downloaded from the Windows Store. Most (if not all) owners of the older Windows 8 devices of that screen size class who upgrade to Windows 10 can still retain the old-style desktop and legacy app support, despite this upgrade.
  • Sirius XM Satellite Radio lifetime subscriptions are no longer being offered to new subscribers. Sirius XM Satellite Radio still honors lifetime subscriptions to people who have bought them in the past, under certain conditions.

Law

  • Many jurisdictions prohibit ex post facto laws, and grandfather clauses can be used to prevent a law from having retroactive effects. For example, in the UK the offence of indecent assault is still charged in respect of crimes committed before the offence was abolished and replaced with sexual assault by the Sexual Offences Act 2003.
  • Section 1 of Article Two of the United States Constitution appears on a cursory reading to stipulate that presidential candidates must be natural born citizens of the United States. However, there is a further category of persons eligible for that office, now exhausted: those who were citizens of the United States at the time of the adoption of that constitution. Without that provision, it would have required a strained reading to construe that all actual presidents born in the colonial era were born in the United States, because the United States did not exist prior to July 4, 1776, the date on which the Declaration of Independence was adopted.
  • Many acts requiring registration to practice a particular profession incorporated transition or "grandfather sections" allowing those who had already practised for a specified time (often three or four years) to be registered under the act even if they did not have the training or qualifications required for new applications for registration. Examples are the Nurses Registration Act 1901 in New Zealand and the Nurses Registration Act 1919 in Britain.
  • In 1949, standards were passed requiring certain fire-safety improvements in schools. However, older schools, such as the Our Lady of the Angels School in Illinois, were not required to be retrofitted to meet the requirements, leading to the deadly Our Lady of the Angels School fire in which 92 students and 3 teachers died.
  • In 1951, the United States ratified the Twenty-second Amendment to the United States Constitution, preventing presidents from running for more than two full terms (or one full term, if they had served more than two years of another person's term). The text of the amendment specifically excluded the sitting president from its provisions, thus making Harry Truman eligible to run for president in 1952—and, theoretically, for every subsequent presidential election thereafter—even though he had served a full term and almost four years of a previous president's term. Truman was highly unpopular and lost the New Hampshire primary by nearly 55% to 44%. Eighteen days later the president announced he would not seek a second full term.
  • In the 1980s, as states in America were increasing the permitted age of drinking to 21 years, many people who were under 21 but of legal drinking age before the change were still permitted to purchase and drink alcoholic beverages. Similar conditions applied when New Jersey and certain counties in New York raised tobacco purchase ages from 18 to 19 years in the early 2000s.
  • In 2012, Macau increased the permitted age of entering casinos to 21. However, casino employees between the ages of 18 and 21 before the change were still permitted to enter their places of employment. This category was exhausted by the end of 2015.
  • During the Federal Assault Weapons Ban, certain firearms made before the ban's enactment were legal to own. Automatic weapons that were manufactured and registered before the Firearm Owners Protection Act (enacted May 19, 1986) may legally be transferred to civilians.
  • According to the Interstate Highway Act, private businesses are not allowed at rest areas along interstates. However, private businesses that began operations before January 1, 1960, were allowed to continue operation indefinitely.
  • Michigan law MCL 287.1101–1123 forbade ownership or acquisition of large and dangerous exotic carnivores as pets. But animals already owned as pets at the time of enactment were grandfathered in, and permitted to be kept.
  • The FCC stated that, as of March 1, 2007, all televisions must be equipped with digital tuners, but stores that had TV sets with analog tuners only could continue to sell analog-tuner TV sets.
  • In 1967, the FCC prohibited companies from owning both a radio and a television station in the same marketing area, but those already owned before the ruling were permanently grandfathered. For example, ABC already owned WABC-TV, 77 WABC and WABC-FM (now WPLJ), and so could continue to own all three stations after the law was passed. But then-current broadcasting companies that had a radio station in a city could not acquire an adjacent television station, and companies that owned a television station in a city could not acquire adjacent radio stations. In 1996, the law was overturned. Companies can now own up to eight radio stations and two television stations in a market, provided that they do not receive more than 33% of that market's advertising revenues.
  • In 1984 Mississippi passed a law changing its official mode of capital punishment from the gas chamber to lethal injection. Under the new law, anyone sentenced after July 1, 1984, was to be executed by lethal injection; those condemned before that date were “grandfathered” into the gas chamber. Therefore, three more convicted murderers would die in the chamber—Edward Earl Johnson and Connie Ray Evans in 1987, and Leo Edwards in 1989. In 1998, the Mississippi Legislature changed the execution law to allow all death row inmates to be executed by lethal injection.
  • In 1965, the Canadian government under Prime Minister Lester B. Pearson passed legislation that required senators to retire when they reached the age of 75. However, senators appointed before the legislation was passed were exempted from the mandatory retirement rule.
  • When Quebec enacted the Charter of the French Language in 1977, making French the province's official language, the famous Montreal kosher-style deli Schwartz's was allowed to keep its name with the apostrophe, a feature not used in French in the possessive form.
  • During Canada's federal Redistribution, a grandfather clause ensures that no Province can have fewer seats after Redistribution than it did in 1985.
  • In the early 2000s the Houston Police Department mandated to police academy graduating classes that tenured officers are required to carry a .40 caliber sidearm - tenured police officers prior to the mandate were grandfathered in where they still carried their existing sidearms.
  • In 2013, Tennessee enacted a law requiring that products labeled as "Tennessee whiskey" be produced in the state, meet the legal definition of bourbon whiskey, and also use the Lincoln County Process. The law specifically allowed Benjamin Prichard's Tennessee Whiskey, which does not use the Lincoln County Process, to continue to be labeled as such.
  • In 2014, Kentucky radically simplified its classification of cities, with the previous system of six population-based classes being replaced by a two-class system based solely on the type of government effective January 1, 2015. In the old classification system, many cities had special privileges (notably in alcoholic beverage control, taxing powers, certain labor laws, and the ability to operate its own school system) based on their class; the new legislation contained elaborate provisions to ensure that no city lost a privilege due to the reclassification.

Standards compliance

  • Strict building codes to withstand frequent seismic activity were implemented in Japan in 1981. These codes applied only to new buildings, and existing buildings were not required to upgrade to meet the codes. One result of this was that during the great Kobe earthquake, many of the pre-1981 buildings were destroyed or written off, whereas most buildings built post-1981, in accordance with the new building codes, withstood the earthquake without structural damage.
  • Wigwag-style railroad crossing signals were deemed inadequate in 1949 and new installations were banned in the United States. Existing wigwag signals were allowed to remain and 65 years later, there are still about 40 wigwag signals in use on railroads in the United States.
  • The UK's national rail infrastructure management company Network Rail requires new locomotives and rolling stock to pass tests for electromagnetic compatibility (EMC) to ensure that they do not interfere with signalling equipment. Some old diesel locomotives, which have been in service for many years without causing such interference, are exempted from EMC tests and are said to have acquired grandfather rights.
  • The Steel Electric-class ferryboats used by Washington State Ferries were in violation of several Coast Guard regulations, but because they were built in 1927, before the enactment of the regulations, they were allowed to sail. Those ferries were decommissioned in 2008.
  • Tolled highways that existed before the Interstate Highway System are exempt from Interstate standards despite being designated as Interstate highways. Many such toll roads (particularly the Pennsylvania Turnpike) remain as such. However, tolled highways built since the Interstate system, such as the tolled section of PA Route 60 and PA Turnpike 576, must be built or upgraded to Interstate standards before receiving Interstate designation. Both highways are to be part of the Interstate system, with PA 60 now I-376 and PA Turnpike 576 to become I-576 in the near future. As well, U.S. Interstate Highway standards mandate a minimum 11-foot median; however, highways built before those standards have been grandfathered into the system. The Kansas Turnpike is the most notable example, as it has been retrofitted with a Jersey barrier along its entire 236-mile (380-km) length.
  • The earliest Ontario 400-series highways and other expressways do not meet current standards, however it would be prohibitively expensive to immediately rebuild them all to updated guidelines, unless a reconstruction is warranted by safety concerns and traffic levels. As a result, substandard sections of freeways such as low overpasses and short acceleration/deceleration lanes are often retrofitted with guard rail, warning signage, lower speed limits, or lighting.
  • The United States Federal Communications Commission has required all radio stations licensed in the United States since the 1930s to have four-letter call signs starting with a W (for stations east of the Mississippi River) or a K (for stations west of the Mississippi River). But stations with three-letter call signs and stations west of the Mississippi River starting with a W and east of the Mississippi River starting with a K—such as WRR in Dallas and WHB in Kansas City, plus KQV and KYW in Pennsylvania, all licensed before the 1930s—have been permitted to keep their call signs. In the western United States, KOA in Denver, KGA in Spokane, KEX in Portland, and KHJ and KFI in Los Angeles, among many others, have been permitted to keep their original or reassigned three-letter call signs. In addition, a new or existing station may adopt a three-letter call set if they have a sister radio or TV station in that market with those calls (examples include WJZ-FM Baltimore and WGY-FM Albany, New York). (Note that stations licensed in Louisiana and Minnesota, the two states with significant territory on both sides of the Mississippi, are allowed to use call signs starting with either W or K, regardless of their location with respect to the river.)
  • In aviation, grandfather rights refers to the control that airlines exert over “slots” (that is, times allotted for access to runways). While the trend in airport management has been to reassert control over these slots, many airlines are able to retain their traditional rights based on current licences.
  • In the UK, until 1992, holders of ordinary car driving licences were allowed to drive buses of any size, provided that the use was not commercial and that there was no element of "hire or reward" in the vehicles' use; in other words, no one was paying to be carried. The law was changed in 1992 so that all drivers of large buses had to hold a PCV (PSV) licence, but anyone who had driven large buses could apply for grandfather rights to carry on doing so.
  • Some MOT test standards in the UK do not apply to vehicles first registered prior to the implementation of the legislation that introduced them. For example, vehicles first registered prior to January 1, 1973 are exempt from the requirement to use retro-reflective yellow/white vehicle registration plates and vehicles first registered prior to January 1, 1965 are exempt from seat belt standards/legislation unless they have been retrospectively fitted.
  • In some U.S. states, the inspection/maintenance (I/M) programs for motor vehicle emission testing have a rolling chassis exemption, e.g. a motor vehicle model 25 years old or more is exempted from emission tests.

Sports

  • In 1920, when Major League Baseball introduced the prohibition of the spitball, the league recognized that some professional pitchers had nearly built their careers on using the spitball. The league made an exception for 17 named players, who were permitted to throw spitballs for the rest of their careers. Burleigh Grimes threw the last legal spitball in 1934.
  • Beginning in 1979, the National Hockey League required all players to wear helmets. Nevertheless, if a player had signed his first professional contract before this ruling, he was allowed to play without a helmet if he so desired. Craig MacTavish was the last player to do so, playing without a helmet up until his retirement in 1997, other notable players include Guy Lafleur and Rod Langway who retired in 1991 and 1993, respectively. A similar rule was passed for NHL officials for the 1988-89 season; any official who started his career before the ruling could also go helmet-less if they so desired. Kerry Fraser was the last referee who was not required to wear a helmet, until the ratification of the new NHL Officials Association collective bargaining agreement on March 21, 2006 required all remaining helmet-less officials to wear one. The NHL created a similar rule in 2013 requiring visors for players with fewer than 25 games' experience.
  • Major League Baseball rule 1.16 requires players who were not in the major leagues before 1983 to wear a batting helmet with at least one earflap. The last player to wear a flapless helmet was the Florida Marlins' Tim Raines in 2002 (career began in 1979). The last player eligible to do so was Julio Franco in 2007 (career began in 1982), although he opted to use a flapped helmet.
  • The NFL outlawed the one-bar facemask for the 2004 season but allowed existing users to continue to wear them (even though by that time, the mask had mostly fallen out of favor, save for a handful of kickers/punters). Scott Player was the last player to wear the one-bar facemask in 2007.
  • For many decades, American League (AL) umpires working behind home plate used large, balloon-style chest protectors worn outside the shirt or coat, while their counterparts in the National League wore chest protectors inside the shirt or coat, more akin to those worn by catchers. In 1977, the AL ruled that all umpires entering the league that year and in the future had to wear the inside protector, although umpires already in the league who were using the outside protector could continue to do so. The last umpire to regularly wear the outside protector was Jerry Neudecker, who retired after the 1985 season. (Since 2000, Major League Baseball has used the same umpire crews for both leagues.)
  • The National Football League (NFL) currently prohibits corporate ownership of teams. Ownership groups can have no more than 24 members, and at least one partner must hold a 30% ownership stake. The league has exempted the Green Bay Packers from this rule; the team has been owned by a publicly owned, nonprofit corporation since 1923, decades before the league's current ownership rules were put in place in the 1980s.
  • Similarly, in association football the Deutsche Fußball Liga, which operates the Bundesliga and 2. Bundesliga, prohibits corporate ownership of more than 49% of teams and rebranding as well (see 50+1 rule). The Royal Dutch Football Association has a similar rule with regard to the Eredivisie. However, Bayer Leverkusen and PSV Eindhoven can maintain their property and names as they were founded in the first decades of the twentieth century by Bayer and Philips as their sport teams. Another Bundesliga side, VfL Wolfsburg, is allowed to remain under the ownership of Volkswagen as it was founded in 1945 as a club for VW workers.
  • Three former venues in the National Hockey LeagueChicago Stadium, Boston Garden and Buffalo Memorial Auditorium—had shorter-than-regulation ice surface, as their construction predated the regulation. The distance was taken out of the neutral zone. All three arenas were replaced by newer facilities by 1996. The regulation does not apply in many minor league venues, and in older minor league venues shorter than regulation, the distance was taken from neutral zones.
  • Five schools that are members of NCAA Division III, a classification whose members are generally not allowed to offer athletic scholarships, are specifically allowed to award scholarships in one or two sports, with at most one for each sex. Each of these schools had a men's team that participated in the NCAA University Division, the predecessor to today's Division I, before the NCAA adopted its current three-division setup in 1973. (The NCAA did not award national championships in women's sports until 1980–81 in Division II and Division III, and 1981–82 in Division I.) Three other schools were formerly grandfathered, but have either moved their Division I sports to Division III or discontinued them entirely.
  • In 2006, NASCAR passed a rule that required teams to field no more than four cars. Since Roush Racing had five cars, they could continue to field five cars until the end of 2009.
  • Jackie Robinson's #42, which he wore when he broke Major League Baseball's 20th-century color line and throughout his Hall of Fame career with the Brooklyn Dodgers, is the subject of two such grandfather clauses.
    • In 1997, MLB prohibited all teams from issuing #42 in the future; current players wearing #42 were allowed to continue to do so. New York Yankees' closer Mariano Rivera was the last active player to be grandfathered in, wearing #42 until he retired after the 2013 season. However, since 2009, all uniformed personnel (players, managers, coaches, umpires) are required to wear #42 (without names) on Jackie Robinson Day.
    • In 2014, Robinson's alma mater of UCLA, where he played four sports from 1939 to 1941, retired #42 across its entire athletic program. (The men's basketball team had previously retired the number for Walt Hazzard.) Three athletes who were wearing the number at the time (in women's soccer, softball, and football) were allowed to continue wearing the number for the rest of their UCLA careers.
  • The NFL introduced a numbering system for the 1973 season, requiring players to be numbered by position. Players who played in the NFL in 1972 and earlier were allowed to keep their old numbers if their number was outside of their range for their position, although New York Giants linebacker Brad Van Pelt wore number 10 despite entering the league in 1973 (Linebackers had to be numbered in the 50s at the time; since 1984 they may now wear numbers in the 50s or 90s. Van Pelt got away with it because he was the team's backup kicker his rookie season). The last player to be covered by the grandfather clause was Julius Adams, a defensive end (19711985, 1987) for the New England Patriots, who wore number 85 through the 1985 season. He wore a different number during a brief return two years later.
    • Similarly, the NFL also banned the use of the numbers 0 and 00 (both treated a single number) for uniforms around the same time, but players Jim Otto and Ken Burrough used the number throughout the 1970s.
  • The National Hot Rod Association is enforcing a grandfather clause banning energy drink sponsors from entering the sport if they were not sponsoring cars as of April 24, 2008, pursuant to the five-year extension of its sponsorship with Coca-Cola, which is changing the title sponsorship from Powerade to Full Throttle Energy Drink.
  • Even though tobacco advertising in car racing was banned, the Marlboro cigarette brand, owned by British American Tobacco in Canada, and Philip Morris International elsewhere, is grandfathered in to sponsoring a car in the F1 series on the agreement that the name is not shown in places that banned it.
  • NASCAR allows some grandfathered sponsorships by energy drink brands in the top-level Monster Energy Cup Series, while rules prohibit new sponsors in that category. Similar policies with regard to telecommunications companies were in effect when the series was sponsored by Sprint. Additionally, some insurance company sponsorships were grandfathered in when the second-level series now known as the Xfinity Series was sponsored by Nationwide Insurance.
  • In 2013, the Professional Bull Riders made it mandatory that all contestants at their events who were born on or after October 15, 1994 ride with helmets. Those born before that date were grandfathered in and permitted to ride with their cowboy hats if so desired.
  • In August 2014, the Baseball Hall of Fame and the Baseball Writers' Association of America (BBWAA) announced changes to the Hall of Fame balloting process effective with the election for the Hall's induction class of 2015. The most significant change was reducing the time frame of eligibility for recently retired players from 15 years to 10. Three players on the 2015 BBWAA ballot who had appeared on more than 10 previous ballots—Don Mattingly, Lee Smith, and Alan Trammell—were exempted from this change, and remained eligible for 15 years (provided they received enough votes to stay on the ballot).
  • In November 2015, Little League Baseball changed its age determination date from April 30 to August 31—a calendar date that falls after the completion of all of the organization's World Series tournaments—effective with the 2018 season. The rule was written so that players born between May 1 and August 31, 2005, who would otherwise have been denied their 12-year-old season in the flagship Little League division, would be counted as 12-year-olds in the 2018 season.
  • In December 2016, French Rugby Federation (FFR) president Bernard Laporte announced that all future members of France national teams in rugby union and rugby sevens would be required to hold French passports. At the time, eligibility rules of World Rugby, the sport's international governing body, required only three years' residency for national team eligibility, and did not require citizenship. Players who had represented France prior to the FFR policy change remain eligible for national team selection.

Tannic acid

From Wikipedia, the free encyclopedia
 
Tannic acid
Tannic acid.svg
Names
IUPAC name
1,2,3,4,6-penta-O-{3,4-dihydroxy-5-[(3,4,5-trihydroxybenzoyl)oxy]benzoyl}-D-glucopyranose
Systematic IUPAC name
2,3-dihydroxy-5-({[(2R,3R,4S,5R,6R)-3,4,5,6-tetrakis({3,4-dihydroxy-5-[(3,4,5-trihydroxyphenyl)carbonyloxy]phenyl}carbonyloxy)oxan-2-yl]methoxy}carbonyl)phenyl 3,4,5-trihydroxybenzoate
Other names
Acidum tannicum
Gallotannic acid
Digallic acid
Gallotannin
Tannimum
Quercitannin
Oak bark tannin
Quercotannic acid
Querci-tannic acid
Querco-tannic acid
Identifiers
3D model (JSmol)
8186386
ChEBI
ChEMBL
ChemSpider
ECHA InfoCard 100.014.321
KEGG
PubChem CID
UNII
Properties
C76H52O46
Molar mass 1701.19 g/mol
Density 2.12g/cm3
Melting point decomposes above 200 °C
2850 g/L or 250 g/L
Solubility 100 g/L in ethanol
1 g/L in glycerol and acetone
insoluble in benzene, chloroform, diethyl ether, petroleum, carbon disulfide, carbon tetrachloride.
Acidity (pKa) ca. 6
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
A bottle of tannic acid (water solution).

Tannic acid is a specific form of tannin, a type of polyphenol. Its weak acidity (pKa around 6) is due to the numerous phenol groups in the structure. The chemical formula for commercial tannic acid is often given as C76H52O46, which corresponds with decagalloyl glucose, but in fact it is a mixture of polygalloyl glucoses or polygalloyl quinic acid esters with the number of galloyl moieties per molecule ranging from 2 up to 12 depending on the plant source used to extract the tannic acid. Commercial tannic acid is usually extracted from any of the following plant parts: Tara pods (Caesalpinia spinosa), gallnuts from Rhus semialata or Quercus infectoria or Sicilian sumac leaves (Rhus coriaria).




According to the definitions provided in external references such as international pharmacopoeia, Food Chemicals Codex and FAO-WHO tannic acid monograph only tannins sourced from the above-mentioned plants can be considered as tannic acid. Sometimes extracts from chestnut or oak wood are also described as tannic acid but this is an incorrect use of the term. It is a yellow to light brown amorphous powder; 2850 grams dissolves in one litre of water (1.7 moles per liter). 




While tannic acid is a specific type of tannin (plant polyphenol), the two terms are sometimes (incorrectly) used interchangeably. The long-standing misuse of the terms, and its inclusion in scholarly articles has compounded the confusion. This is particularly widespread in relation to green tea and black tea, both of which contain tannin but not tannic acid.

Tannic acid is not an appropriate standard for any type of tannin analysis because of its poorly defined composition.

Quercitannic and gallotannic acids

Quercitannic acid is one of the two forms of tannic acid found in oak bark and leaves. The other form is called gallotannic acid and is found in oak galls.

The quercitannic acid molecule is also present in quercitron, a yellow dye obtained from the bark of the Eastern black oak (Quercus velutina), a forest tree indigenous in North America. It is described as a yellowish-brown amorphous powder. 

In 1838, Jöns Jacob Berzelius wrote that quercitannate is used to dissolve morphine.

In 1865 in the fifth volume of "A dictionary of chemistry", Henry Watts wrote :
It exhibits with ferric salts the same reactions as gallotannic acid. It differs however from the latter in not being convertible into gallic acid, and not yielding pyrogallic acid by dry distillation. It is precipitated by sulfuric acid in red flocks. (Stenhouse, Ann. Ch. Pharm. xlv. 16.)
According to Rochleder (ibid lxiii. 202), the tannic acid of black tea is the same as that of oak-bark.
In 1880, Etti gave for it the molecular formula C17H16O9. He described it as an unstable substance, having a tendency to give off water to form anhydrides (called phlobaphenes), one of which is called oak-red (C34H30O17). For him, it was not a glycoside.

In Allen's "Commercial Organic Analysis", published in 1912, the formula given was C19H16O10.

Other authors gave other molecular formulas like C28H26O15, while another formula found is C28H24O11.

According to Lowe, two forms of the principle exist – one soluble in water, of the formula C28H28O14, and the other scarcely soluble, C28H24O12. Both are changed by the loss of water into oak red, C28H22O11.

Quercitannic acid was for a time a standard used to assess the phenolic content in spices, given as quercitannic acid equivalent.

In an interesting historical note, the inventor Edward G. Acheson (Inventor of Carborundum) discovered that gallotannic acid greatly improved the plasticity of clay. In his report of this discovery in 1904 he noted that the only known historical reference to the use of organic material added to clay is the use of straw mixed with clay described in the Bible, Exodus 1:11 and that the Egyptians must have been aware of his (re-)discovery. He stated "This explains why the straw was used and why the children of Israel were successful in substituting stubble for straw, a course that would hardly be possible, were the fibre of the straw depended upon as a bond feasible for the clay, but quite reasonable where the extract of the plant was used."

Uses

Tannins are a basic ingredient in the chemical staining of wood, and are already present in woods like oak, walnut, and mahogany. Tannic acid can be applied to woods low in tannin so chemical stains that require tannin content will react. The presence of tannins in the bark of redwood (Sequoia) is a strong natural defense against wildfire, decomposition, and infestation by certain insects such as termites. It is found in the seeds, bark, cones, and heartwood.

Tannic acid is a common mordant used in the dyeing process for cellulose fibers such as cotton, often combined with alum and/or iron. The tannin mordant should be done first as metal mordants combine well with the fiber-tannin complex. However this use has lost considerable interest.

Similarly tannic acid can also be used as an aftertreatment to improve wash fastness properties of acid dyed polyamide. It is also an alternative for fluorcarbon aftertreatments to impart anti-staining properties to polyamide yarn or carpets. However, due to economic considerations currently the only widespread use as textile auxiliary is the use as an agent to improve chlorine fastness, i.e. resistance against dye bleaching due to cleaning with hypochlorite solutions in high-end polyamide 6,6-based carpets and swimwear. It is, however, used in relatively small quantities for the activation of upholstery flock; this serves as an anti-static treatment.

Tannic acid is used in the conservation of ferrous (iron based) metal objects to passivate and inhibit corrosion. Tannic acid reacts with the corrosion products to form a more stable compound, thus preventing further corrosion from taking place. After treatment the tannic acid residue is generally left on the object so that if moisture reaches the surface the tannic acid will be rehydrated and prevent or slow any corrosion. Tannic acid treatment for conservation is very effective and widely used but it does have a significant visual effect on the object, turning the corrosion products black and any exposed metal dark blue. It should also be used with care on objects with copper alloy components as the tannic acid can have a slight etching effect on these metals.

Tannic acid is also found in commercially available iron/steel corrosion treatments, such as Hammerite Kurust.

Use in food

Use of tannic acid in food applications is widespread; significant amounts are used as process aids in beer clarification, aroma compound in soft drinks and juices. Also important are applications in the wine industry, where it finds use as a natural clarifying agent, colour stabilizer and taste enhancer.

In many parts of the world, such uses are permitted. In the United States, tannic acid is generally recognized as safe by the Food and Drug Administration.

According to EU directive 89/107/EEC tannic acid cannot be considered as a food additive and consequently does not hold an E number. Under directive 89/107/EEC tannic acid can be referred to as a food ingredient. The E-number E181 is sometimes incorrectly used to refer to tannic acid; this in fact refers to the INS number assigned to tannic acid under the FAO-WHO Codex Alimentarius system.

Uses as a medication

In conjunction with magnesium and sometimes activated charcoal, tannic acid was once used as a treatment for many toxic substances, such as strychnine, mushroom, and ptomaine poisonings in the late 19th and early 20th centuries.

The introduction of tannic acid treatment of severe burn injuries in the 1920s significantly reduced mortality rates. During World War I, tannic acid dressings were prescribed to treat "burns, whether caused by incendiary bombs, mustard gas, or lewisite. After the war this use was abandoned due to the development of more modern treatment regimens. 

Tannic acid is still used in pharmaceutical applications to produce albumin tannate which is used as an antidiarrheal agent. Tannic acid is also used to produce tannate salts of certain antihistamine and antitussive products to impart increased stability or slow release properties to the active pharmaceutical ingredient. Further to this, tannic acid is the principal but perhaps minimally effective ingredient in anti-allergy sprays.

Tannins have also been reported to exert many physiological effects, such as to accelerate blood clotting, reduce blood pressure, decrease the serum lipid level, produce liver necrosis, and modulate immunoresponses. This would explain common folklore such as that soaking feet in tannic acid (or strong tea) can treat or prevent blisters, foot odor and rough, dry feet.

Hazards

Tannic acid could cause potential health hazards such as damage to the eye, skin, respiratory tract, and gastrointestinal tract. It may cause irritation, redness, pain, blurred vision, and possible eye damage. When tannic acid is absorbed through the skin in harmful amounts, it may cause irritation, redness, and pain. Nausea, vomiting and diarrhoea are symptoms of tannic acid ingestion and prolonged exposure may cause liver damage. Upon inhalation, tannic acid may cause respiratory tract irritation.

Crocodilian coloration

Skin color in Crocodilia (crocodiles and alligators) is very dependent on water quality. Algae-laden waters produce greener skin, while tannic acid in the water from decay of leaves from overhanging trees (which produces some types of blackwater rivers) often produce darker skin in these animals.

History of chocolate

From Wikipedia, the free encyclopedia
 
"Traités nouveaux & curieux du café du thé et du chocolate", by Philippe Sylvestre Dufour, 1685.

The history of chocolate began in Mesoamerica. Fermented beverages made from chocolate date back to 450 BC. The Aztecs believed that cacao seeds were the gift of Quetzalcoatl, the god of wisdom, and the seeds once had so much value that they were used as a form of currency. Originally prepared only as a drink, chocolate was served as a bitter liquid, mixed with spices or corn puree. It was believed to be an aphrodisiac and to give the drinker strength. Today, such drinks are also known as "Chilate" and are made by locals in the South of Mexico. After its arrival to Europe in the sixteenth century, sugar was added to it and it became popular throughout society, first among the ruling classes and then among the common people. In the 20th century, chocolate was considered essential in the rations of United States soldiers during war.

The word "chocolate" comes from the Classical Nahuatl word Xocolātl, and entered the English language from the Spanish language.

History

An Aztec woman generates foam by pouring chocolate from one vessel to another in the Codex Tudela

Cultivation, consumption, and cultural use of cacao were extensive in Mesoamerica where the cacao tree is native. When pollinated, the seed of the cacao tree eventually forms a kind of sheath, or ear, 20" long, hanging from the tree trunk itself. Within the sheath are 30 to 40 brownish-red almond-shaped beans embedded in a sweet viscous pulp. While the beans themselves are bitter due to the alkaloids within them, the sweet pulp may have been the first element consumed by humans.

Cacao pods grow in a wide range of colors, from pale yellow to bright green, all the way to dark purple or crimson. The skin can also vary greatly - some are sculpted with craters or warts, while others are completely smooth. This wide range in type of pods is unique to cacaos in that their color and texture does not necessarily determine the ripeness or taste of the beans inside.

Evidence suggests that it may have been fermented and served as an alcoholic beverage as early as 1400 BC.

Cultivation of the cacao was not an easy process. Part of this was because cacao trees in their natural environment grow to 60 feet tall or more. When the trees were grown in a plantation; however, they grew to around 20 feet tall.

While researchers do not agree on which Mesoamerican culture first domesticated the cacao tree, the use of the fermented bean in a drink seems to have arisen in North America (Mesoamerica—Central America and Mexico). Scientists have been able to confirm its presence in vessels around the world by evaluating the "chemical footprint" detectable in the micro samples of contents that remain. Ceramic vessel with residues from the preparation of chocolate beverages have been found at archaeological sites dating back to the Early Formative (1900–900 BC) period. For example, one such vessel found at an Olmec archaeological site on the Gulf Coast of Veracruz, Mexico dates chocolate's preparation by pre-Olmec peoples as early as 1750 BC. On the Pacific coast of Chiapas, Mexico, a Mokayanan archaeological site provides evidence of cacao beverages dating even earlier, to 1900 BC.

Pueblo people, who lived in an area that is now the U.S. Southwest, imported cacao from Mesoamerican cultures in southern Mexico between 900 and 1400. They used it in a common beverage consumed by everyone in their society.

Archaeological evidence of Cacao in Mesoamerica

Nature Ecology & Evolution reported probably the earliest cacao use from approximately 5,300 years ago recovered from the Santa Ana (La Florida) site in southeast Ecuador. Another find of chemically traced cacao was in 1984 when a team of archaeologists in Guatemala explored the Mayan site of Río Azul. They discovered fifteen vessels surrounding male skeletons in the royal tomb. One of these vessels was beautifully decorated and covered in various Mayan glyphs. One of these glyphs translated to "kakaw", also known as cacao. The inside of the vessel was lined with a dark-colored powder, which was scraped off for further testing. Once the archaeologists took this powder to the Hershey Center for Health and Nutrition to be tested, they found trace amounts of theobromine in the powder, a major indicator of cacao. This cacao was dated to sometime between 460 and 480 AD.
 
Cacao powder was also found in beautifully decorated bowls and jars, known as tecomates, in the city of Puerto Escondido. Once thought to have been a very rare commodity, cacao was found in many more tecomates than once thought possible. However, since this powder was only found in bowls of higher quality, it led archaeologists to believe that only wealthier people could afford such bowls, and therefore the cacao. The cacao tecomates are thought to have been a centerpiece to social gatherings between people of high social status.

Olmec use

Earliest evidence of domestication of the cacao plant dates to the Olmec culture from the Preclassic period. The Olmecs used it for religious rituals or as a medicinal drink, with no recipes for personal use. Little evidence remains of how the beverage was processed.

Mayan use

The Mayans, (in Guatemala), by contrast, do leave some surviving writings about cacao which confirm the identification of the drink with the gods. The Dresden Codex specifies that it is the food of the rain deity Kon, the Madrid Codex that gods shed their blood on the cacao pods as part of its production. The Maya people gathered once a year to give thanks to the god Ek Chuah who they saw as the Cacao god. The consumption of the chocolate drink is also depicted on pre-Hispanic vases. The Maya seasoned their chocolate by mixing the roasted cacao seed paste into a drink with water, chile peppers and cornmeal, transferring the mixture repeatedly between pots until the top was covered with a thick foam.

There were many uses for cacao among the Maya. It was used in official ceremonies and religious rituals, at feasts and festivals, as funerary offerings, as tribute, and for medicinal purposes. Both cacao itself and vessels and instruments used for the preparation and serving of cacao were used for important gifts and tribute. Cacao beans were used as currency, to buy anything from avocados to turkeys to sex. A rabbit, for example, was worth ten cacao beans, (called “almonds” by the early sixteenth-century chronicler Francisco Oviedo y Valdés), a slave about a hundred, and the services of a prostitute, eight to ten “according to how they agree,”. The beans were also used in betrothal and marriage ceremonies among the Maya, especially among the upper classes.

“The form of the marriage is: the bride gives the bridegroom a small stool painted in colors, and also gives him five grains of cacao, and says to him “These I give thee as a sign that I accept thee as my husband.” And he also gives her some new skirts and another five grains of cacao, saying the same thing.”

Maya preparation of cacao started with cutting open cacao pods to expose the beans and the fleshy pulp. The beans were left out to ferment for a few days. In some cases, the beans were also roasted over an open fire in order to add a smoky flavor to it. The beans then had their husks removed and were ground into a paste. Since sweeteners were rarely used by Maya, they flavored their cacao paste with additives like flowers, vanilla pods, and chilies. The vessel used to serve this chocolate liquid was stubbier by nature to help froth the liquid better, which was very important to the Maya. The vessels also tended to be decorated in intricate designs and patterns, which tended to only be accessible by the rich.

Aztec use

By 1400, the Aztec Empire took over a sizable part of Mesoamerica. They were not able to grow cacao themselves, but were forced to import it. All of the areas that were conquered by the Aztecs that grew cacao beans were ordered to pay them as a tax, or as the Aztecs called it, a "tribute". The cacao bean became a form of currency. The Spanish conquistadors left records of the value of the cacao bean, noting for instance that 100 beans could purchase a canoe filled with freshwater or a turkey hen. The Aztecs associated cacao with the god Quetzacoatl, whom they believed had been condemned by the other gods for sharing chocolate with humans. Unlike the Maya of Yucatán, the Aztecs drank chocolate cold. It was consumed for a variety of purposes, as an aphrodisiac or as a treat for men after banquets, and it was also included in the rations of Aztec soldiers.

History in Europe

Early history

Until the 16th century, the cacao tree was wholly unknown to Europeans.

Christopher Columbus encountered the cacao bean on his fourth mission to the Americas on August 15, 1502, when he and his crew seized a large native canoe that proved to contain among other goods for trade, cacao beans. His son Ferdinand commented that the natives greatly valued the beans, which he termed almonds, "for when they were brought on board ship together with their goods, I observed that when any of these almonds fell, they all stooped to pick it up, as if an eye had fallen." But while Columbus took cacao beans with him back to Spain, it made no impact until Spanish friars introduced chocolate to the Spanish court.

A Lady Pouring Chocolate by Jean-Étienne Liotard (1744)

Spanish conquistador Hernán Cortés may have been the first European to encounter chocolate when he observed it in the court of Montezuma in 1519. In 1568, Bernal Díaz, who accompanied Cortés in the conquest of Mexico, wrote of this encounter which he witnessed:
From time to time they served him [Montezuma] in cups of pure gold a certain drink made from cacao. It was said that it gave one power over women, but this I never saw. I did see them bring in more than fifty large pitchers of cacao with froth in it, and he drank some of it, the women serving with great reverence.
José de Acosta, a Spanish Jesuit missionary who lived in Peru and then Mexico in the later 16th century, described its use more generally:
Loathsome to such as are not acquainted with it, having a scum or froth that is very unpleasant taste. Yet it is a drink very much esteemed among the Indians, wherewith they feast noble men who pass through their country. The Spaniards, both men and women that are accustomed to the country are very greedy of this chocolate. They say they make diverse sorts of it, some hot, some cold, and some temperate, and put therein much of that "chili"; yea, they make paste thereof, the which they say is good for the stomach and against the catarrh.
After the Spanish conquest of the Aztecs, chocolate was imported to Europe. In the beginning, Spaniards would use it as a medicine to treat illnesses such as abdominal pain because it had a bitterness to it. Once sweetened, it transformed. It quickly became a court favorite. It was still served as a beverage, but the addition of sugar or honey counteracted the natural bitterness. The Spaniards initially intended to recreate the original taste of the Mesoamerican chocolate by adding similar spices, but this habit had faded away by the end of the eighteenth century. Within about a hundred years, chocolate established a foothold throughout Europe.

According to the authority on the Spanish language, the Royal Spanish Academy, the Spanish word "chocolate" is derived from the Nahuatl word "xocolatl" (pronounced Nahuatl pronunciation: [ ʃoˈkolaːtɬ]), which is made up from the words "xococ" meaning sour or bitter, and "atl" meaning water or drink. However, as William Bright noted the word "chocolatl" doesn't occur in central Mexican colonial sources making this an unlikely derivation. Santamaria gives a derivation from the Yucatec Maya word "chokol" meaning hot, and the Nahuatl "atl" meaning water. More recently Dakin and Wichman derive it from another Nahuatl term, "chicolatl" from Eastern Nahuatl meaning "beaten drink". They derive this term from the word for the frothing stick, "chicoli". The word xocoatl means beverage of the maize. The words "cacaua atl" mean drink of cacao. The word "xocolatl" does not appear in Molina's dictionary, Vocabulario en Lengua Castellana y Mexicana y Mexicana y Castellana.

Expansion

An early 20th-century chocolate advertisement

The new craze for chocolate brought with it a thriving slave market, as between the early 17th and late 19th centuries the laborious and slow processing of the cacao bean was manual. Cacao plantations spread, as the English, Dutch, and French colonized and planted. With the depletion of Mesoamerican workers, largely to disease, cocoa beans production was often the work of poor wage laborers and African slaves. 

1729 - The first mechanic cocoa grinder was invented in Bristol, UK. Walter Churchman petitions king of England for patent and sole use of an invention for the “expeditious, fine and clean making of chocolate by an engine.” The patent was granted by His Majesty King George II to Walter Churchman for a water engine used to make chocolate. Churchman probably used water-powered edge runners for preparing cacao beans by crushing on a far larger scale than previously. The patent for a chocolate refining process was later bought by J. S. Fry & Sons in 1761. 

Wind-powered and horse-drawn mills were used to speed production, augmenting human labor. Heating the working areas of the table-mill, an innovation that emerged in France in 1732, also assisted in extraction. The Chocolaterie Lombart, created in 1760, claimed to be the first chocolate company in France, ten years before Pelletier et Pelletier.

New processes that speed the production of chocolate emerged early in the Industrial Revolution. In 1815, Dutch chemist Coenraad van Houten introduced alkaline salts to chocolate, which reduced its bitterness. A few years thereafter, in 1828, he created a press to remove about half the natural fat (cacao butter) from chocolate liquor, which made chocolate both cheaper to produce and more consistent in quality. This innovation introduced the modern era of chocolate. Known as "Dutch cocoa", this machine-pressed chocolate was instrumental in the transformation of chocolate to its solid form when in 1847 Joseph Fry learned to make chocolate moldable by adding back melted cacao butter. Milk had sometimes been used as an addition to chocolate beverages since the mid-17th century, but in 1875 Daniel Peter invented milk chocolate by mixing a powdered milk developed by Henri Nestlé with the liquor. In 1879, the texture and taste of chocolate was further improved when Rodolphe Lindt invented the conching machine.

Lindt & Sprüngli AG, a Swiss-based concern with global reach, had its start in 1845 as the Sprüngli family confectionery shop in Zurich that added a solid-chocolate factory the same year the process for making solid chocolate was developed and later bought Lindt's factory. Besides Nestlé, several chocolate companies had their start in the late 19th and early 20th centuries. Cadbury was manufacturing boxed chocolates in England by 1868. In 1893, Milton S. Hershey purchased chocolate processing equipment at the World's Columbian Exposition in Chicago and soon began the career of Hershey's chocolates with chocolate-coated caramels.

Due to improvements in machines, chocolate underwent a transformation from a primarily a drink to food, and different types of chocolate began to emerge. At the same time, the price of chocolate began to drop dramatically in the 1890s and 1900s as the production of chocolate began to shift away from the New World to Asia and Africa. Therefore, chocolate could be purchased by the middle class. Due to the lower cost of chocolate, it happened a problem that forced child labor. In 1900–1907, Cadbury's fell into a scandal due to their reliance on West African slave plantations.

Although it was men leading the charge towards mass production of chocolate for everyday people, advertisements also targeted women, who “were charged with providing wholesome cocoa for respectable consumption within the family,”. Women were also targeted by advertising campaigns within courtship rituals, though most early advertising was aimed more at housewives and mothers than at single women.

Modern use

Roughly two-thirds of the world's cocoa is produced in Western Africa, with Ivory Coast being the largest source, producing a total crop of 1,448,992 tonnes. Ghana, Nigeria, and Cameroon are other West African countries among the top 5 cocoa-producing countries in the world. Like many food industry producers, individual cocoa farmers are at the mercy of volatile world markets. The price can vary from between £500 ($945) and £3,000 ($5,672) per ton in the space of just a few years. While investors trading in cocoa can dump shares at will, individual cocoa farmers can not ramp up production and abandon trees at anywhere near that pace.

Only three to four percent of "cocoa futures" contracts traded in the cocoa markets ever end up in the physical delivery of cocoa. Every year seven to nine times more cocoa is bought and sold on the exchange than exists.

Convection

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