Iron dichromate

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A reddish-brown crystalline material occasionally used as a transparent pigment in oil and watercolor paints. Iron dichromate is prepared by heating Ferric hydroxide in Chromic acid or by mixing Potassium chromate with iron sulfate.

Synonyms and Related Terms

basic iron chromate; ferric dichromate; dicromato de ferro (Port.)


  • Human carcinogen.
  • Skin contact may cause allergies.
  • Acute ingestion may cause fatal chromium poisoning.
  • Chronic inhalation may cause lung cancer and respiratory irritation.
  • ThermoFisher: SDS

Physical and Chemical Properties

Soluble in water and acids.

Composition Fe2(CrO7)3

Resources and Citations

  • H. Kuhn, M.Curran, "Chrome Yellow and Other Chromate Pigments", Artists Pigments, Volume 1, R. Feller (ed.), Cambridge University Press: Cambridge, 1986.
  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993