Difference between revisions of "Ruberythric acid"
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== Synonyms and Related Terms == | == Synonyms and Related Terms == | ||
| − | + | ácido ruberítrico (Port.); rubian; ruberythrinic acid; rubianic acid | |
== Other Properties == | == Other Properties == | ||
Revision as of 06:44, 24 July 2013
Description
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.
Authority
- 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"