Difference between revisions of "Carminic acid"

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== Synonyms and Related Terms ==
 
== Synonyms and Related Terms ==
  
Natural Red 4; CI  75470; cido (Esp.); acido carminico (It.); cido carmnico (Port.)
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Natural Red 4; CI  75470; ácido (Esp.); acido carminico (It.); ácido carmínico (Port.)
  
 
[[[SliderGallery rightalign|carminic acid.jpg~Chemical structure]]]
 
[[[SliderGallery rightalign|carminic acid.jpg~Chemical structure]]]
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== Authority ==
 
== Authority ==
  
* Richard S. Lewis, Richard S. Lewis, ''Hawley's Condensed Chemical Dictionary'', Van Nostrand Reinhold, New York, 10th ed., 1993
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* 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, Thomas B. Brill, ''Light Its Interaction with Art and Antiquities'', Plenum Press, New York City, 1980
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* Thomas B. Brill, ''Light Its Interaction with Art and Antiquities'', Plenum Press, New York City, 1980
  
* F. Crace-Calvert, F. Crace-Calvert, ''Dyeing and Calico Printing'', Palmer & Howe, London, 1876
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* 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

Revision as of 07:43, 24 July 2013

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.)

Chemical structure

Carminic acid.jpg


Other 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 (dec)
Molecular Weight mol. wt. = 492.39

Hazards and Safety

Combustible.

Mallinckrodt Baker: MSDS

Authority

  • 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

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