Carminic acid: Difference between revisions
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[[[SliderGallery rightalign|carminic acid.jpg~Chemical structure]]] | [[[SliderGallery rightalign|carminic acid.jpg~Chemical structure]]] | ||
== Risks == | == Risks == | ||
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* Soluble in water, ethanol, concentrated sulfuric acid. Insoluble in ether, benzene, chloroform. | * Soluble in water, ethanol, concentrated sulfuric acid. Insoluble in ether, benzene, chloroform. | ||
* UV max in water = 500 nm. | * UV max in water = 500 nm. | ||
* Composition = C22H20O13 | |||
* CAS = 1260-17-9 | |||
* Melting Point = 136 C (dec) | |||
* Molecular Weight = 492.39 g/mol | |||
==Resources and Citations== | ==Resources and Citations== | ||
* 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 | ||
* ''The Merck Index'', Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 1891 | * ''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 | * 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 | * 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 | * Sigma Dyes, Stains and Natural Pigments, Infrared Library, Nicolet, 1991-1995 Comment: OMNIC: formula= C22H20O13, CAS= 1260-17-9 | ||
* Wikipedia: [https://en.wikipedia.org/wiki/Carminic_acid Carminic acid] Accessed April 2026 | |||
[[Category:Materials database]] | [[Category:Materials database]] | ||
Latest revision as of 10:06, 28 April 2026
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 = 492.39 g/mol
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
- Wikipedia: Carminic acid Accessed April 2026