slovodefinícia
C6H2HO3CO2H
(gcide)		Gallic \Gal"lic\ (277), a. [From Gall the excrescence.]
Pertaining to, or derived from, galls, nutgalls, and the
like.
[1913 Webster]

Gallic acid (Chem.), an organic acid, very widely
distributed in the vegetable kingdom, being found in the
free state in galls, tea, etc., and produced artificially.
It is a white, crystalline substance, C6H2(HO)3.CO2H,
with an astringent taste, and is a strong reducing agent,
as employed in photography. It is usually prepared from
tannin, and both give a dark color with iron salts,
forming tannate and gallate of iron, which are the
essential ingredients of common black ink.
[1913 Webster]
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