Munjistin: Difference between revisions
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1,3-dihydroxyanthraquinone-2-carboxylic acid; CI 75370; munjistina (Esp., Port.) | 1,3-dihydroxyanthraquinone-2-carboxylic acid; CI 75370; munjistina (Esp., Port.) | ||
== | == Physical and Chemical Properties == | ||
Soluble in boiling water, ether, benzene, hot glacial acetic acid. Slightly soluble in cold water. | Soluble in boiling water, ether, benzene, hot glacial acetic acid. Slightly soluble in cold water. | ||
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! scope="row"| Melting Point | ! scope="row"| Melting Point | ||
| 232-233 | | 232-233 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" | * ''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 17:01, 1 October 2022
Description
Orange leaflet crystals. Munjistin is one of the natural colorants extracted from madder and munjeet roots. It dissolves in alkalis to give a red solution and turns yellow in acids. Munjistin precipitates with alum to give a bright orange color. It has been used with an alum mordant to dye wool orange.
Synonyms and Related Terms
1,3-dihydroxyanthraquinone-2-carboxylic acid; CI 75370; munjistina (Esp., Port.)
Physical and Chemical Properties
Soluble in boiling water, ether, benzene, hot glacial acetic acid. Slightly soluble in cold water.
| Melting Point | 232-233 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"