Difference between revisions of "Crocetin"
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== Description == | == Description == | ||
| − | A bright yellow natural dyestuff. Crocetin is the primary colorant in [ | + | 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 == | == Synonyms and Related Terms == | ||
| 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. |
| − | + | * Forms a blue solution in concentrated sulfuric acid. | |
| − | Forms a blue solution in concentrated sulfuric acid. | + | * Forms dark red crystals from acetic anhydride extract. |
| − | + | * Abs. max 464, 436, 411 nm | |
| − | Forms dark red crystals from acetic anhydride extract. | ||
| − | |||
| − | Abs. max 464, 436, 411 nm | ||
{| class="wikitable" | {| class="wikitable" | ||
| Line 26: | Line 23: | ||
|- | |- | ||
! scope="row"| Melting Point | ! scope="row"| Melting Point | ||
| − | | 285 | + | | 285 C |
|} | |} | ||
| − | == | + | == 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 | * ''The Merck Index'', Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 2578 | ||
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* Colour Index International online at www.colour-index.org | * 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 |
[[Category:Materials database]] | [[Category:Materials database]] | ||
Latest revision as of 12:56, 7 July 2022
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 C |
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