Yellow plate-like crystals. Rubiadin is one of the natural dyes extracted from madder roots and other Rubiaceae family plants. It dissolves in alkalis to form a red solution and turns yellow in acids.
Synonyms and Related Terms
1,3-hydroxy-2-methylanthraquinone; CI 75350; rubiadina (Port.)
Soluble in ethanol, ether, benzene. Insoluble in boiling water, lime water.
Absorption max = 246, 280, 415 nm.
|Molecular Weight||mol. wt. = 254.24|
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"