Ammonium dichromate

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Orange-red prismatic needles. Ammonium dichromate is mixed with Albumin and water to make a light sensitive emulsion for photolithography. It is also used in photography, process engraving, leather tanning, porcelain glazes, textile dyeing, and pyrotechnics.

Synonyms and Related Terms

ammonium bichromate

Chemical structure

Ammonium dichromate.jpg


  • Corrosive. Contact causes burns to skin and membranes.
  • Strong Oxidizer. Contact with other materials may cause flames.
  • Carcinogenic. Toxic by inhalation and ingestion.
  • Fisher Scientific: SDS

Physical and Chemical Properties

Soluble in water and ethanol.

Composition (NH4)2Cr2O7
CAS 7789-09-5
Melting Point 180 C (dec)
Density 2.155 g/ml
Molecular Weight mol. wt. = 252.07

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
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 544

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