Ferrous oxalate

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A pale yellow powder used in photographic developers for silver bromide-gelatin plates. Ferrous oxalate is also used to tint windshields and sunglasses. Commercially sold as Ferrox, it is also used as a pigment in plastics, paints, glass, and lacquers.

Synonyms and Related Terms



  • Toxic.
  • Decomposes at 160C to release carbon monoxide.

Physical and Chemical Properties

Soluble in acids. Insoluble in water.

Composition FeC2O4.2H2O
CAS 516-03-0
Melting Point 150-160 C (d)
Density 2.28 g/ml
Molecular Weight mol. wt. = 143.86

Resources and Citations

  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 4099