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Flavine, flā′vin, n. a concentrated preparation of quercitron bark, till recently an important yellow dye.

It is usual to add also a small amount of the yellow dyestuff flavine in order to obtain a yellower shade of scarlet.

So-called Flavine is a commercial preparation of Quercitron Bark consisting of quercitrin or of quercetin; it is much used by wool-dyers for the production of bright yellow and orange colours.

Flavine is used in small quantity along with cochineal for dyeing scarlet on wool.

The alizarin yellows, R and GG, anthracene yellow, diamond flavine, chrome yellow, diamond yellow, carbazol yellow, chrysamine, &c., are Direct Colours with mordant-dyeing properties.