Ferric ammonium sulfate

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Pale lilac crystals that effloresce in air. Ferric ammonium sulfate is used in toning solutions for black and white photo processing. It is also used as a mordant in textile dyeing.

Synonyms and Related Terms

ferric alum; iron ammonium sulfate; ferric ammonium alum; ammonium ferric sulfate; ferric ammonium sulphate (Br.)


  • Skin contact, inhalation or ingestion may cause slight irritation.
  • IntegraChem: SDS

Physical and Chemical Properties

Soluble in water. Insoluble in ethanol.

Composition FeNH4(SO4)2.12H2O
Melting Point 37 C
Density 1.71 g/ml

Resources and Citations

  • 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