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Ponceau 6R

Ponceau 6R

Class: Azo
Ionisation: Acid

Chemical structure of Ponceau 6R

Common Name: Ponceau 6R
Suggested Name: Ponceau 6R
Other Names:

Crystal scarlet
Crystal ponceau 6R
Brilliant crystal scarlet 6R

C.I. Number: 16250
C.I. Name: Acid red 44
Color: Red
Solubility Aqueous: Readily
Solubility Ethanol: Readily
Absorption Maximum: 513 (Gurr), 510 (Aldrich)
Empirical Formula: C20H12N2O7S2Na2
Formula Weight: 502.446


Although not commonly used, this dye has been recommended for staining fibrin with the MSB (Martius, Scarlet and Blue) which is a reliable trichrome technique for this material.


  1. R. D. Lillie.
    Conn’s Biological Stains
    Originally published by: The Blakiston Co.
    Williams & Wilkins, Baltimore, MD., U.S.A.
  2. Edward Gurr, (1971)
    Synthetic dyes in biology, medicine and chemistry
    Academic Press, London, England.
  3. Aldrich Chemical Catalogue, 1992
    Aldrich Chemical Company, Milwaukee, WI, USA.