Toluidine red explained

Toluidine red is an organic compound with the formula . A dark red solid, the compound is classified as a azo dye consisting of a 2-naphthol group linked to a 2-nitro-4-methylphenyl substituent.[1] Toluidine red is a traditional pigment, found in oil paints.[2] Although once popular, it suffers as a pigment owing to "insufficient lightfastness and bleeding when incorporated into a paint system."[3]

Safety

It is classified as carcinogenic, a property that it shares with many azo dyes.[4]

References

  1. Book: 10.1002/0471238961.151807011001060605.a01.pub2 . Pigments, Organic . Kirk-Othmer Encyclopedia of Chemical Technology . 2004 . Jaffe . Edward E. . 978-0-471-48494-3 .
  2. 10.1016/j.saa.2008.11.029 . Synthetic Organic Pigments of the 20th and 21st Century Relevant to Artist's Paints: Raman Spectra Reference Collection . 2009 . Scherrer . Nadim C. . Stefan . Zumbuehl . Francoise . Delavy . Annette . Fritsch . Renate . Kuehnen . Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy . 73 . 3 . 505–524 . 19136293 . 2009AcSpA..73..505S .
  3. 10.1107/S0021889871006307 . Crystallography of Toluidine Red . 1971 . Chung . F. H. . Journal of Applied Crystallography . 4 . 1 . 79–80 . 1971JApCr...4...79C .
  4. 10.1016/s1383-5742(99)00090-3 . Genotoxic hazards of azo pigments and other colorants related to 1-phenylazo-2-hydroxynaphthalene . 2000 . Møller . Peter . Wallin . Håkan . Mutation Research/Reviews in Mutation Research . 462 . 1 . 13–30 . 10648921 .

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