Red-brown plate crystals. Pseudopurpurin is one of the natural colorants extracted from madder roots and other Rubiaceae family plants. It forms an insoluble red precipitate with alum and alkaline earths.
Synonyms and Related Terms
1,2,4-trihydroxyanthraquinone; Natural Red 16; CI 75410; purpurine; purpuriini (Fin.); purpurina (Esp., Port.)
Slightly soluble in hot benzene, chloroform. Insoluble in cold water, ethanol.
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",