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gallic acid (HO)3C6H2COOH

Also known as 3,4,5-trihydroxybenzoic acid, an acid occurring plants, including oak galls, sumach, and tea. Gallic acid is obtained from tannins by hydrolysis. It is used in ink, dyes, and as a mild antiseptic and astringent. On heating it gives pyrogallol, a photographic developer.

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