Difference between revisions of "Crocetin"
Jump to navigation
Jump to search
m (Text replace - "== Authority ==" to "== Sources Checked for Data in Record ==") |
|||
| Line 7: | Line 7: | ||
8,8'-diaporcarotenedioic acid; CI 75100; crocetina (Esp., It., Port.) | 8,8'-diaporcarotenedioic acid; CI 75100; crocetina (Esp., It., Port.) | ||
| − | == | + | == Physical and Chemical Properties == |
Soluble dilute alkali solutions and pyridine. Slightly soluble in water, organic solvents. | Soluble dilute alkali solutions and pyridine. Slightly soluble in water, organic solvents. | ||
| Line 29: | Line 29: | ||
|} | |} | ||
| − | == | + | == Resources and Citations == |
* Helmut Schweppe, Schweppe color collection index and information book | * Helmut Schweppe, Schweppe color collection index and information book | ||
Revision as of 10:37, 28 October 2020
Description
A bright yellow natural dyestuff. Crocetin is the primary colorant in Saffron, crocus, Wongsky, unki, gunari, and flowers of Nyctanthes arbor-tristis. Crocetin is a Substantive dye that produces a strong yellow color on Alum mordanted and unmordanted Wool. Copper mordanting produces a greenish yellow shade.
Synonyms and Related Terms
8,8'-diaporcarotenedioic acid; CI 75100; crocetina (Esp., It., Port.)
Physical and Chemical Properties
Soluble dilute alkali solutions and pyridine. Slightly soluble in water, organic solvents.
Forms a blue solution in concentrated sulfuric acid.
Forms dark red crystals from acetic anhydride extract.
Abs. max 464, 436, 411 nm
| Composition | C20H24O4 |
|---|---|
| CAS | 27876-94-4 |
| Melting Point | 285 |
Resources and Citations
- Helmut Schweppe, Schweppe color collection index and information book
- The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 2578
- 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