Difference between revisions of "Carminic acid"
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== Description == | == Description == | ||
| − | A bright red or dark purple brown powder. Carminic acid is the primary colorant in [ | + | A bright red or dark purple brown powder. Carminic acid is the primary colorant in [[cochineal]] dyestuff. It is a tricyclic compound that is extracted from the dried insects ''Coccus cacti'' with water. Carminic acid changes colors with acidity. It is a bright red in neutral solutions, below pH 4.8, it is yellow and above 6.2, it is a deep violet color. Carminic acid is used as a lake pigment for oil colors, as a red dye for photography and as a textile colorant. |
== Synonyms and Related Terms == | == Synonyms and Related Terms == | ||
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[[[SliderGallery rightalign|carminic acid.jpg~Chemical structure]]] | [[[SliderGallery rightalign|carminic acid.jpg~Chemical structure]]] | ||
| − | == | + | == Risks == |
| − | Soluble in water,ethanol, concentrated sulfuric acid. Insoluble in ether, benzene, chloroform. UV max in water = 500 nm. | + | * Combustible. |
| + | * ThermoFisher: [https://www.fishersci.com/store/msds?partNumber=AC346630010&productDescription=CARMINIC+ACID%2C+70-90%25+1GR&vendorId=VN00032119&countryCode=US&language=en SDS] | ||
| + | |||
| + | ==Physical and Chemical Properties== | ||
| + | |||
| + | * Soluble in water, ethanol, concentrated sulfuric acid. Insoluble in ether, benzene, chloroform. | ||
| + | * UV max in water = 500 nm. | ||
{| class="wikitable" | {| class="wikitable" | ||
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! scope="row"| Melting Point | ! scope="row"| Melting Point | ||
| − | | 136 (dec) | + | | 136 C (dec) |
|- | |- | ||
! scope="row"| Molecular Weight | ! scope="row"| Molecular Weight | ||
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| − | == | + | ==Resources and Citations== |
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* Richard S. Lewis, ''Hawley's Condensed Chemical Dictionary'', Van Nostrand Reinhold, New York, 10th ed., 1993 | * Richard S. Lewis, ''Hawley's Condensed Chemical Dictionary'', Van Nostrand Reinhold, New York, 10th ed., 1993 | ||
Latest revision as of 13:53, 20 May 2022
Description
A bright red or dark purple brown powder. Carminic acid is the primary colorant in Cochineal dyestuff. It is a tricyclic compound that is extracted from the dried insects Coccus cacti with water. Carminic acid changes colors with acidity. It is a bright red in neutral solutions, below pH 4.8, it is yellow and above 6.2, it is a deep violet color. Carminic acid is used as a lake pigment for oil colors, as a red dye for photography and as a textile colorant.
Synonyms and Related Terms
Natural Red 4; CI 75470; ácido (Esp.); acido carminico (It.); ácido carmínico (Port.)
Risks
- Combustible.
- ThermoFisher: SDS
Physical and Chemical Properties
- Soluble in water, ethanol, concentrated sulfuric acid. Insoluble in ether, benzene, chloroform.
- UV max in water = 500 nm.
| Composition | C22H20O13 |
|---|---|
| CAS | 1260-17-9 |
| Melting Point | 136 C (dec) |
| Molecular Weight | mol. wt. = 492.39 |
Resources and Citations
- Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
- The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 1891
- Thomas B. Brill, Light Its Interaction with Art and Antiquities, Plenum Press, New York City, 1980
- F. Crace-Calvert, Dyeing and Calico Printing, Palmer & Howe, London, 1876
- Sigma Dyes, Stains and Natural Pigments, Infrared Library, Nicolet, 1991-1995 Comment: OMNIC: formula= C22H20O13, CAS= 1260-17-9