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Substance Name: C.I. Pigment Red 231
RN: 68186-99-2


  • TSCA Definition 2018: An inorganic pigment that is the reaction product of high temperature calcination in which aluminum oxide and manganese (III) oxide in varying amounts are homogeneously and ionically interdiffused to form a crystalline matrix of corundum. Its composition may include P2O5 as a modifier. This substance is identified in the COLOUR INDEX by Colour Index Constitution Number, C.I. 77005.

Molecular Formula

  • Unspecified
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Names and Synonyms


  • EC 269-061-0
  • EINECS 269-061-0
  • Manganese alumina pink corundum

Systematic Names

  • C.I. Pigment Red 231
  • Manganese alumina pink corundum

Registry Numbers

CAS Registry Number

  • 68186-99-2

Other Registry Number

  • 95193-78-5

System Generated Number

  • 0068186992