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Is Vat Blue 36 vegan?

Vat Blue 36 is a synthetic vat dye chemically related to indigo, produced by condensation of 4-methyl-5-chloro-7-methoxy-3-indolinone and 5,7-dichloro-3-(2H)-thianaphthenone. It is used for dyeing cellulosic fibres. It is a synthetic organic dye.

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