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NPR Vol.4 [2005] >
NPR Vol.4(4) [July-August 2005] >


Title: Dye
Issue Date: Aug-2005
Publisher: CSIR
Abstract: Lac, a natural resin of insect origin, is used extensively for natural food additives, cosmetics and as a colorant for silk and cotton dyeing. Lac dye, which is the soluble part of stick lac, is composed mainly of two major anthraquinone-based components: laccaic acids A and B; the minor components, laccaic acids C, D and E, have also been isolated. The UV–VIS spectrum of laccaic acid A is very similar to the spectrum of crude laccaic acid in ethanol, with absorption maxima for laccaic acid A reported at 290, 340, 500 and 530 nm in this solvent; in water, λmax values were reported at 292 and 490nm and at 500nm in acetone for this acid (referred to as laccaic acid.
Page(s): 283
ISSN: 0975-1092 (Online); 0972-592X (Print)
Source:NPR Vol.4(4) [July-August 2005]

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