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Substance Name: C.I. Acid Orange 1
RN: 8004-41-9


  • TSCA Definition 2018: This substance is identified in the COLOUR INDEX by Colour Index Constitution Numbers, C.I. 13090 and 13091.

Molecular Formula

  • Unspecified
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Names and Synonyms


  • EINECS 232-329-2

Systematic Names

  • Benzenesulfonic acid, 4-((4-(nitrosophenylamino)phenyl)azo)-, nitro derivs.
  • C.I. Acid Orange 1

Registry Numbers

CAS Registry Number

  • 8004-41-9

Other Registry Number

  • 12220-03-0

System Generated Number

  • 0008004419