This is a bottle of tannic acid.

Tannic acid, a commercial form of tannin, is a polyphenol. Its weak acidity (pK_a around 10) is due to these phenol groups in the structure. Tannic acid is a basic ingredient in the chemical staining of wood. The tannic acid or tannin is 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. Image File history File linksMetadata Download high resolution version (1944x2592, 875 KB) I, the creator of this work, hereby release it into the public domain. ... Image File history File linksMetadata Download high resolution version (1944x2592, 875 KB) I, the creator of this work, hereby release it into the public domain. ... Tannins are astringent, bitter-tasting plant polyphenols that bind and precipitate proteins. ... Polyphenols are a group of vegetable chemical substances, characterized by the presence of more than one phenol group. ... In chemistry and biochemistry, acid dissociation constant, the acidity constant, or the acid-ionization constant (Ka) is a specific type of equilibrium constant that indicates the extent of dissociation of hydrogen ions from an acid. ... Phenol, also known under the old name carbolic acid, is a colorless crystalline solid with a typical sweet tarry odor. ... A tree trunk as found at the Veluwe, The Netherlands Wood derives from woody plants, notably trees but also shrubs. ... Species See List of Quercus species The term oak can be used as part of the common name of any of several hundred species of trees and shrubs in the genus Quercus, and some related genera, notably Lithocarpus. ... Species See text The walnuts (genus Juglans) are plants in the walnut family Juglandaceae. ... Genera and Species Entandophragma - Sapele - Utile or African Mahogany Guarea - Pink Mahogany Khaya - Ivory Coast Mahogany - Senegal Mahogany Swietenia - Honduras Mahogany - West Indian Mahogany Toona - Indian Mahogany - Chinese Mahogany The name Mahogany was first used in the New World for three trees of the genus Swietenia, namely (West Indian Mahogany...

Tannic acid is the most common mordant for cellulose fibers such as cotton. Tannin is often combined with alum and/or iron. The tannin mordant should be done first as metal mordants combine well with the fiber-tannin complex. Look up Mordant on Wiktionary, the free dictionary A mordant is a substance used to set dyes. ... Cellulose (C6H10O5)n is a long-chain polymer polysaccharide carbohydrate, of beta-glucose. ... Picking cotton in Georgia Cotton is a soft fiber that grows around the seeds of the cotton plant, a shrub native to the tropical and subtropical regions of both the Old World and the New World. ... A crystal of Alum Alum, in chemistry, is a term given to the crystallized double sulfates of the typical formula M+2SO4·M3+2(SO4)3·24H2O, where M+ is the sign of an alkali metal (lithium, sodium, potassium, rubidium, or caesium), and M3+ denotes one of the trivalent metals... General Name, Symbol, Number iron, Fe, 26 Chemical series transition metals Group, Period, Block 8, 4, d Appearance lustrous metallic with a grayish tinge Atomic mass 55. ...

The presence of tannic acid in the bark of redwood sequoias is a strong natural defense against wildfire, decomposition and infestation.It is found in the seeds, bark, cones, and heartwood. Redwood is a name used for several species of trees with wood with a red or reddish colour; see each species for individual details. ... Binomial name Sequoia sempervirens (D. Don) Endl. ... The Old Fire burning in the San Bernardino Mountains (image taken from the International Space Station) A wildfire, also known as a forest fire, vegetation fire, grass fire, brush fire, or bushfire (in Australasia), is an uncontrolled fire often occurring in wildland areas, but which can also consume houses or... This article is in need of attention; please see the talk page. ... This page is a candidate to be moved to Wiktionary. ... This writeup is about biological seeds; for other meanings see Seed (disambiguation). ... BARK (Binär Automatisk ReläKalkylator) was completed in February 1950 at a cost of 400. ... A cone is a basic geometrical shape: see cone (geometry). ... A tree trunk as found at the Veluwe, The Netherlands Wood is a material found as the primary content of the stems of woody plants, especially trees, but also shrubs. ...

The chemical formula for commercial tannic acid is often given as C₇₆H₅₂O₄₆, but in fact it contains a mixture of related compounds. Its structure is based mainly on glucose esters of gallic acid. It is a yellow to light brown amorphous powder which is highly soluble in water; one gram dissolves in 0.35 mL of water. Glucose (Glc), a monosaccharide, is one of the most important carbohydrates. ... General formula of an ester of a carboxylic acid. ... Gallic acid is an organic acid, also known as 3,4,5-trihydroxybenzoic acid, found in gallnuts, sumac, witch hazel, tea leaves, oak bark, and other plants. ... An amorphous solid is a solid in which there is no long-range order of the positions of the atoms. ... The gram or gramme, symbol g, is a unit of mass. ... The millilitre (spelled milliliter in American English and German) is a metric unit of volume that is equal to one thousandth of a litre. ...

It is said that soaking feet in tannic acid (or strong tea) can help prevent blisters.

References

The Merck Index, 9th edition, Merck & Co., Rahway, New Jersey, 1976.

External links

"Tannin chemistry" (PDF, 1.45 MB)