High Quality Content by WIKIPEDIA articles! 1,2,4- Trihydroxyanthraquinone, commonly called purpurin, is a naturally occurring red/yellow dye. It is an organic compound with the formula of C14H5O2(OH)3, formally derived from anthraquinone by replacement of three hydrogen atoms by hydroxyl (OH) groups. Purpurin is also called verantin, smoke Brown G, hydroxylizaric acid, and C.I. 58205. It is a minor component of the classical lake pigment "madder lake" or Rose Madder.

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