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


PR003 toluidine red.jpg

Other Properties

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

Hazards and Safety

Ingestion can cause cyanosis. Suspected carcinogen.

Sources Checked for Data in Record

  • 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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