Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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catechol ( pyrocatechin, pyrocatechol )

A colorless crystal (C 6 H 6 O 2 ), soluble in water, alcohol, ether, benzene, and alkalis. An alkaline solution gives a coloration with ferric chloride, which turns brown on standing in air. It can be obtained fromCATECHU , a natural dye, or prepared by fusing orthobenzenedisulfonic acid with caustic soda. Catechol is the principal constituent of the condensed (catechol) tannins. See also: VEGETABLE TANNINS . (235 , 306 )

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