Ruberythric acid

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Yellow, needle crystals. Ruberythric acid is one of the natural colorants extracted from madder roots. It decomposes to form alizarin in boiling water. The brilliant red color is usually mordanted with potassium, barium, or calcium salts.

Synonyms and Related Terms

ácido ruberítrico (Port.); rubian; ruberythrinic acid; rubianic acid

Other Properties

Soluble in hot water. Slightly soluble in cold water, ethanol. Decomposes in acids and alkalis.

Composition C25H26O13
Melting Point 258-261
Molecular Weight mol. wt. = 534.47

Additional Information

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"