Quercitron


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 It might be outdated or ideologically biased.

Quercitron

 

the cut up bark (or extract of the bark) of several North American oaks (mainly Quercus velutina tinctoria), used to dye silk and wool yellow. Quercitron contains the glycoside quercitrin, which when boiled with acids breaks down into the sugar rhamnose and the dyestuff quercetin (tetraoxy-flavonol: C15H10O7). Quercetin is in the form of lemon-yellow needles, which are poorly soluble in water.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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