Difference between revisions of "Gunari"
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Natural Yellow 4 | Natural Yellow 4 | ||
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Crocetin is soluble in water, ethanol, alkali solutions. Crocetin forms a blue solution in concentrated sulfuric acid. | Crocetin is soluble in water, ethanol, alkali solutions. Crocetin forms a blue solution in concentrated sulfuric acid. | ||
| − | == | + | ==Resources and Citations== |
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* Helmut Schweppe, Schweppe color collection index and information book | * Helmut Schweppe, Schweppe color collection index and information book | ||
Latest revision as of 14:31, 27 August 2022
Description
A bright yellow, natural dyestuff obtained from the leaves of the Indian mahogany tree, Cedula toona, native to the southern Asia. Gunari has been used to dye wool and silk a bright yellow color. The primary colorant in gunari is Crocetin. Crocetin is a substantive dye that is also found in Saffron.
Synonyms and Related Terms
Natural Yellow 4
Physical and Chemical Properties
Crocetin is soluble in water, ethanol, alkali solutions. Crocetin forms a blue solution in concentrated sulfuric acid.
Resources and Citations
- Helmut Schweppe, Schweppe color collection index and information book
- Colour Index International online at www.colour-index.org
- Judith Hofenk-de Graaff, Natural Dyestuffs: Origin, Chemical Constitution, Identification, Central Research Laboratory for Objects of Art and Science, Amsterdam, 1969