Ferric ammonium sulfate

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Description

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.)

Other Properties

Soluble in water. Insoluble in ethanol.

Composition FeNH4(SO4)2.12H2O
Melting Point 37
Density 1.71

Hazards and Safety

Skin contact, inhalation or ingestion may cause slight irritation.

Sources Checked for Data in Record

  • 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

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