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Substance Name: C.I. Pigment Black 28
RN: 68186-91-4


  • TSCA Definition 2017: An inorganic pigment that is the reaction product of high temperature calcination in which copper (II) oxide and chromium (III) oxide in varying amounts are homogeneously and ionically interdiffused to form a crystalline matrix of spinel. Its composition may include any one or a combination of the modifiers Fe2O3 and MnO. This substance is identified in the COLOUR INDEX by Colour Index Constitution Number, C.I. 77428.

Molecular Formula

  • Unspecified
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Names and Synonyms


  • Copper chromite Black spinel
  • EC 269-053-7
  • EINECS 269-053-7

Systematic Names

  • C.I. Pigment Black 28
  • Copper chromite Black spinel

Registry Numbers

CAS Registry Number

  • 68186-91-4

Other Registry Number

  • 335592-14-8

System Generated Number

  • 0068186914