Xanthopurpurin

Description

Yellow needle crystals. Xanthopurpurin is one of the natural colorants extracted from Madder and other Rubiaceae family plants. It dissolves in alkalis to give a red color and turns yellow in acids.

Synonyms and Related Terms

1,3-dihydroxyanthraquinone; CI 75340; purpuroxanthin; xantopurpurina (Esp., Port.)

Physical and Chemical Properties

• Soluble in ethanol, benzene.
• Melting Point = 269-270 C

Resources and Citations

• H.Schweppe, J.Winter, "Madder and Alizarin", Artists Pigments, Volume 3, E. West FitzHugh (ed.), Oxford University Press: Oxford, 1997.