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Colorless needles and plates that forma a red solution. Rosaniline is formed from one molecule of Aniline and two of toluidine. All varieties of magenta dyes are salts this tripheylmethane compound. Chlorination of rosaniline produces Magenta (rosaniline chloride). Currently, rosaniline is used as a Fungicide, fabric Dye, and Ink colorant. It is also a Fluorochrome. It has a mean excitation wavelength of 570 nm (green) and a mean emission wavelength of 625 nm (Wolbers et al. 1990).

Synonyms and Related Terms

roseaniline (sp); pararosaniline; rosaniline hydrochloride (magenta); CI 42500

Chemical structure


Physical and Chemical Properties

Soluble in acids, hot ethanol and aniline. Slightly soluble in boiling water. Insoluble in ether and benzene.

Composition C20H19N3
CAS 25620-78-4
Melting Point 205 C
Molecular Weight mol. wt. = 305.38


  • Potential carcinogen.
  • Contact causes irritation.
  • Fisher Scientific: MSDS

Resources and Citations

  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • Richard C. Wolbers, Nanette T. Sterman, Chris Stavroudis, Notes for Workshop on New Methods in the Cleaning of Paintings, J.Paul Getty Trust, Los Angeles, 1990
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983
  • F. Crace-Calvert, Dyeing and Calico Printing, Palmer & Howe, London, 1876
  • Aldrich Chemical Catalog