C6H2HO3CO2H

1 definition found

From The Collaborative International Dictionary of English v.0.48 [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]