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 hydroxide ferric hydroxide in acid chromic acid or by mixing chromate potassium chromate with sulfate iron sulfate.

Synonyms and Related Terms

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

Other Properties

Soluble in water and acids.

Composition Fe2(CrO7)3

Hazards and Safety

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

Additional Information

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, Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993

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