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.)
Soluble in ethanol, benzene.
H.Schweppe, J.Winter, "Madder and Alizarin", Artists Pigments, Volume 3, E. West FitzHugh (ed.), Oxford University Press: Oxford, 1997.
Sources Checked for Data in Record
- Artists' Pigments: A Handbook of their History and Characteristics, Elisabeth West FitzHugh, Oxford University Press, Oxford, Vol. 3, 1997 Comment: H.Schweppe, J.Winter, "Madder and Alizarin"