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Ionisation: Basic

Chemical structure of Pararosanilin

Common Name: Pararosanilin
Suggested Name: Pararosanilin
Other Names:

Magenta 0 Basic fuchsin

C.I. Number: 42500
C.I. Name: Basic red 9
Color: Red
Solubility Aqueous: 0.26%
Solubility Ethanol: 0.26%
Absorption Maximum: 537 (Gurr), 545 (Conn) 544 (Aldrich)
Empirical Formula: C19H18N3Cl
Formula Weight: 323.8


Pararosanilin (or pararosaniline) is one of the major constituents of Basic fuchsin, together with Rosanilin, Magenta II and New fuchsin. It is the component which makes the best Schiff's reagent, although samples of basic fuchsin can vary considerably in the proportion of the dye. Pararosanilin may be purchased under its own name, and is more reliable for Shiff's reagent when this is done. Compare the formula of the constituents of basic fuchsin.


  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.