Hansa red

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Originally a Hoechst AG trademark for a line of bright, transparent red synthetic organic pigments. Hansa reds, also called toluidine reds, are based on the reaction of beta-naphthol with 2-nitro-4-toluidine. Toluidine red was first synthesized in 1905. In general, toluidine reds have fair lightfastness and weather resistance, and they have a tendency to bleed. They are used in industrial coatings for air-dried and baked enamels and auto finishes. Toluidine reds are also used in wax crayons, pastels and watercolors.

See also Hansa.

Synonyms and Related Terms

toluidine red; Pigment Red 3; CI 12120


PR3 kremer 23950.TIF


PR004 Hansa Red R (Tate).PNG


Pigment number Manufacture Pigment name Manufacture CI number Comments
PR003 Kremer studio red, helio 23950
PR004 unknown Hansa red R (beta-naphthol) unknown sample from Tate Collection


  • Ingestion can cause cyanosis.
  • Suspected carcinogen.

Physical and Chemical Properties

Soluble in many organic solvents. Resistant to acid, alkali and soap.

Resources and Citations

  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • Michael McCann, Artist Beware, Watson-Guptill Publications, New York City, 1979
  • Monona Rossol, The Artist's Complete Health and Safety Guide, Allworth Press, New York, 1994
  • B. Berrie, S.Q. Lomax, 'Azo Pigments: Their History, Synthesis, Properties and Use in Artists' Materials', Studies in the History of Art , National Gallery of Art, Washington DC, No. 57, 1997

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