Skip to main content

Sudan III


Sudan III is a lysochrome (fat-soluble dye) diazo dye used for staining of triglycerides in frozen sections, and some protein bound lipids and lipoproteins on paraffin sections. It has the appearance of reddish brown crystals and a maximum absorption at 507(304) nm. Sudan III is a dye used for Sudan staining. Similar dyes include Oil Red O, Sudan IV, and Sudan Black B. Sudan I, Sudan III, and Sudan IV have been classified as category 3 carcinogens by the International Agency for Research on Cancer. Its risk and safety phrases are -/. Its other names are Sudan Red BK, Fat Ponceau G, Cerasin Red, C.I. 26100, Solvent Red 23, Sudan Red, Sudan Red III, Sudan V, Sudan Red B, Sudan G, Scarlet B, and Tony Red. In industry, it is used to color nonpolar substances like oils, fats, waxes, greases, various hydrocarbon products, and acrylic emulsions.


Substance data page for Sudan III


Chemistry educational resource for Sudan III (standard InChIKey FHNINJWBTRXEBC-HXEHWPEMSA-N). Oil red; Oil Scarlet; Tetrazobenzene-beta-naphthol; Tony Red. Follow the page link to go to the compound page on the Learn Chemistry wiki.