Difference between revisions of "Ruberythric acid"
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ácido ruberítrico (Port.); rubian; ruberythrinic acid; rubianic acid | ácido ruberítrico (Port.); rubian; ruberythrinic acid; rubianic acid | ||
| − | == | + | ==Risks== |
| + | * NIH: [https://pubchem.ncbi.nlm.nih.gov/compound/Ruberythric-acid Info page] | ||
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| + | ==Physical and Chemical Properties== | ||
Soluble in hot water. Slightly soluble in cold water, ethanol. Decomposes in acids and alkalis. | Soluble in hot water. Slightly soluble in cold water, ethanol. Decomposes in acids and alkalis. | ||
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! scope="row"| Melting Point | ! scope="row"| Melting Point | ||
| − | | 258-261 | + | | 258-261 C |
|- | |- | ||
! scope="row"| Molecular Weight | ! scope="row"| Molecular Weight | ||
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| − | == | + | ==Resources and Citations== |
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* ''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" | * ''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" | ||
Latest revision as of 08:38, 28 June 2022
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
Risks
- NIH: Info page
Physical and Chemical Properties
Soluble in hot water. Slightly soluble in cold water, ethanol. Decomposes in acids and alkalis.
| Composition | C25H26O13 |
|---|---|
| Melting Point | 258-261 C |
| Molecular Weight | mol. wt. = 534.47 |
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"