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From what is alizarin traditionally obtained?

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From what is alizarin traditionally obtained?
posted Jul 3, 2020 by Riteshwar

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Ground roots of common madder
Alizarin is a crimson dye, used at one time in a lengthy and several-layer dyeing process known as Turkey Red, which gives either red, violet or brownish-red depending on the mordant used. By the 19th century alizarin was synthesised for commercial use. The natural alizarin is still used for artists' paints.

answer Jul 4, 2020 by Balwinder