Azocarmine

Azocarmine G

Azocarmine B

Property Data Data
Common name
Suggested name
Other names
C.I. number
C.I. name
Class
Ionisation
Solubility aqu.
Solubility eth.
Absorption max.
Colour
Empirical formula
Formula weight
Azocarmine G
Azocarmine G

50085
Acid red 101
Quinone-imine
Acid
Moderate
Moderate
510 (Gurr)
Red
C28H18N3O6S2Na
579.6
Azocarmine B
Azocarmine B

50090
Acid red 103
Quinone-imine
Acid
Readily
Sparing
505 (Gurr)
Red
C28H17N3O9S3Na2
681.6

These dyes are often substituted for each other. Azocarmine without any B or G designation is sometimes all that is given as identification. In most cases, either can be used. It has been specified as the plasma stain in some trichrome methods. It should be noted that neither is an azo dye and neither has any relationship to carmine.

Since azocarmine B is more soluble in water than azocarmine A, it may be preferable to use it.

 

Reference
R. D. Lillie.
Conn's Biological Stains
Williams & Wilkins, Baltimore, MD., U.S.A.

Edward Gurr, (1971)
Synthetic dyes in biology, medicine and chemistry
Academic Press, London, England.

 


 

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