Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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pyrogallol

A crystalline, toxic phenol (C 6 H 6 O 3 ), having weak acidic properties, prepared by heating gallic acid with water. It is readily soluble in water, alcohol, and ether. Alkaline solutions rapidly absorb oxygen from the atmosphere, becoming dark brown in color. Pyrogallol is used in photography, as well as in the manufacture of dyes and in dyeing processes. (175 , 195 )




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