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Orange-red needle crystals. Morindone is one of the natural colorants extracted from Madder, Lorinda and Coprosma plants in the Rubiaceae family. It dissolves in alkalis and acids to give a blue-violet color but it precipitates with alum lake as an orange red.

Synonyms and Related Terms

1,5,6-trihydroxy-2-methylanthraquinone; CI 75430; morindin

Other Properties

  • Soluble in methanol, ethanol, ether, benzene, glacial acetic acid. Insoluble in water.
  • Melting Point = 264-275 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"