Polyazo Dye

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Polyazo Dye


an azo dye with more than two —N= N— azo groups; such dyes belong to the group of direct dyes.

Polyazo dyes are usually superior to other direct dyes in color fastness but are inferior in brightness. The production of polyazo dyes is more complicated than that of azo dyes and is accompanied by a series of side reactions, which results in low yields (sometimes 50 percent or less). Polyazo dyes are used for dyeing cotton and other cellulose fibers.

An example of a polyazo dye is the direct light-fast blue


Chekalin, M. A., B. V. Pesset, and B. A. Ioffe. Tekhnologiia organicheskikh krasitelei i promezhutochnykh produktov. Leningrad, 1972.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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The solophenyl black dye (direct black 22) is classified as Index 35435, indicating that it is a polyazo dye. (17, 18) its structure is reported in figure 3.With respect to the oxidation of azo dyes like the solophenyl black FR by laccases and peroxidases, several authors report the formation of naphthoquinones (19-22).