Iron chromate

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Chrome yellow background
MFA# 40.777


A yellow powder occasionally used as a pigment called siderin yellow. Iron chromate is precipitated from a solution of a chromate salt, such as Potassium dichromate by the addition of Ferric chloride. The pure pigment is bright yellow, but some residual impurities, such as iron oxide, may result in a dull orange pigment color. Siderin yellow is compatible with all paint binders. It has also been used as a gray or brown ceramic glaze and as a colorant in glass and enamel.

Synonyms and Related Terms

siderin yellow; Pigment Yellow 45; CI 77505; chromate de fer (Fr.); cromato de ferro (Port.); chromate of iron; ferric chromate


  • 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 acids. Insoluble in water, and ethanol.

Composition Fe2(CrO4)3
CAS 10294-52-7
Molecular Weight mol. wt. = 459.73

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
  • Michael McCann, Artist Beware, Watson-Guptill Publications, New York City, 1979
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983