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Class: Oxazin
Ionisation: Basic

Chemical structure of Gallocyanin

Common Name: Gallocyanin
Suggested Name: Gallocyanin
Other Names:

C.I. Number: 51030
C.I. Name: Mordant blue 10
Color: Blue
Solubility Aqueous: Poor
Solubility Ethanol: Poor
Absorption Maximum: 636 (Conn), 601 (Aldrich)
Empirical Formula: C15H13N2O5Cl
Formula Weight: 336.7


When mordanted with iron alum, gallocyanin makes a useful nuclear stain, suitable as an alum hematoxylin substitute in H&E. Einarson used it with chrome alum to demonstrate nucleic acids.


  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.