the active ingredient of quebracho and quebracho substitutes, such as mangrove bark, chestnut extract, and hemlock.
any of various complex phenolic substances of plant origin; used in tanning and in medicine
Occurs naturally in the bark and fruit of many plants and trees. Used for its moisture retaining properties.
An acidic flavor that is used as a natural flavoring ingredient.
A complex natural organic compound of a yellowish colour used as an astringent.
One of many naturally occurring organic acids, tannic acid leaches from leaves and other organic material, giving water a tea or coffee color. The water is not polluted but in its natural condition; it has a low pH.
This comes from the skins and stems of the fruit and vastly improves the taste of most wines, giving them some astringency that may otherwise be lacking. Red fruits and grapes are usually rich in tannins, as a rule, and therefore don't need the addition of any extra. In flower and grain wines the addition of 1 teaspoon per 5L may be required. Tannin also helps with the keeping qualities of the wine.
Natural tannic acid can be found in the bark of oak trees as well as in cherries, tea and coffee. Used as an astringent, tannic acid may tint the hair and skin brown when applied topically.
Tannic acid, a commercial form of tannin, is a polyphenol. Its weak acidity (pKa around 10) is due to these phenol groups in the structure. Tannic acid is a basic ingredient in the chemical staining of wood.
