Haematein and its Derivatives

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Abstract
A crystalline hydrochloride of Haematein has been prepared, and this is the first record of a salt from which Haematein is readily recoverable. A mechanism of the action of strong acids on Haematein is proposed, and salts of isohaematein are examined. Haematein is converted into solid products, very soluble in cold water, by interaction with sodium bisulphate or sodium thioglycollate; the structures of such addition products are discussed. The thioglycollate derivative dyed mordanted wool a fast black of excellent colour value.

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