Tannin

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Tannic acid, a type o tannin

A tannin (an aa kent as vegetable tannin, naitural organic tannins, or sometimes tannoid, i.e. a type o biomolecule, as opponed tae modren synthetic tannin) is an astringent, bitter plant polyphenolic compoond that binds tae an precipitates proteins an various ither organic compoonds includin amino acids an alkaloids.