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Orange G

Orange G

Class: Azo
Ionisation: Acid

Chemical structure of Orange G

Common Name: Orange G
Suggested Name: Orange G
Other Names:

C.I. Number: 16230
C.I. Name: Acid orange 10
Color: Orange
Solubility Aqueous: 10.86%
Solubility Ethanol: 10.86%
Absorption Maximum: 472 (Gurr), 475 (Aldrich), 476-480 (Conn)
Empirical Formula: C16H10N2O7S2Na2
Formula Weight: 452.386


Orange G is a valuable acid dye used in many staining methods, including Papanicolauo's OG6 stain. It is often combined with other yellow dyes in alcoholic solution to stain erythrocytes in trichrome methods, and is used for demonstrating cells in the pancreas and pituitary.


  1. R. D. Lillie.
    Conn’s Biological Stains
    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.