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Ionisation: Basic

Chemical structure of Rosanilin

Common Name: Rosanilin
Suggested Name: Rosanilin
Other Names:

Magenta I Basic fuchsin

C.I. Number: 42510
C.I. Name: Basic violet 14
Color: Red
Solubility Aqueous: 0.39%
Solubility Ethanol: 0.39%
Absorption Maximum: 550 (Conn), 539 (Gurr)
Empirical Formula: C20H20N3Cl
Formula Weight: 337.9


Rosanilin (or Rosaniline) is one of the constituents of Basic fuchsin, together with Pararosanilin, Magenta II and New fuchsin. See a comparison of the formula of these dyes.


  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.