Definition of Pirogallol
Pyr`o*gal"lol (?), n. [Pyrogallic
+ -ol.] (Chem.) A phenol metameric with
phloroglucin, obtained by the distillation of gallic acid as a
poisonous white crystalline substance having acid properties, and
hence called also pyrogallic acid. It is a strong reducer, and
is used as a developer in photography and in the production of certain
dyes.
- Webster's Unabridged Dictionary (1913)
- (chemistry) a poisonous trihydroxy phenol, 1,2,3-trihydroxybenzene, C6H3(OH)3, used is a photographic developer
- The Nuttall Encyclopedia
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