Pseudopurpurin

Description

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.)

Physical and Chemical Properties

• Slightly soluble in hot benzene, chloroform. Insoluble in cold water, ethanol.
• Melting Point = 229.5-230.5 C

Resources and Citations

• 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",