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Chromoxane Cyanin R

Chromoxane Cyanin R

Ionisation: Acid

Chemical structure of Chromoxane Cyanin R

Common Name: Solochrome cyanin R
Suggested Name: Chromoxane cyanin R
Other Names:

Alizarol cyanin R Eriochrome cyanin R

C.I. Number: 43820
C.I. Name: Mordant blue 3
Color: Yellow brown
Solubility Aqueous: Very
Solubility Ethanol: Very
Absorption Maximum: 518 (Gurr) 512 (Aldrich)
Empirical Formula: C23H15O9SNa3
Formula Weight: 536.4


Chromoxane cyanin R, when used with an iron alum mordant, forms a lake which is valued as a substitute for hematoxylin in the H&E stain. Care should be taken with its identification as the supplying companies use eriochrome cyanin R and alizarol cyanin R as its names, but Conn applies these two names to another, closely related dye, CI 43810. It can also be used for the detection of some metals in tissue.


  1. R. D. Lillie.
    Conn’s Biological Stains
    Williams & Wilkins, Baltimore, MD., U.S.A.
  2. Aldrich chemical catalogue, 1992
    Aldrich Chemical Company, Milwaukee, WI, USA.
  3. Edward Gurr, 1971
    Synthetic dyes in biology, medicine and chemistry
    Academic Press, London, England.