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Chemical structure



A tradename for shiny, yellow-brown powder that is the ammonium salt of aurin tricarboxylic acid. Aluminon forms brightly colored lakes with Aluminum, Chromium, Iron, and Beryllium salts. It is generally used for the detection of Alum in aqueous extractions of paper.

Synonyms and Related Terms

ammonium salt of aurine tricarboxylic acid; Lysofon; ammonium aurintricarboxylate;


  • Skin contact causes irritation.
  • Harmful if swallowed or inhaled.
  • Fisher Scientific: SDS

Physical and Chemical Properties

  • Soluble in water.
  • The reagent solution is prepared by dissolving 1 g of salt in 1 liter of distilled water.
Composition C22H23N3O9
CAS 569-58-4
Melting Point 220.5 C (dec)
Molecular Weight mol. wt. = 473.43

Resources and Citations

  • For alum detection procedures see: N.Odegaard, S.Carroll, W.Zimmt, Material Characterization Tests for Objects of Art and Archaeology Archetype Publications, London, 2000, p. 34.
  • 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 330
  • A Glossary of Paper Conservation Terms, Margaret Ellis (ed.), Conservation Center of the Institute of Fine Arts, New York City, 1998
  • CRC Handbook of Chemistry and Physics, Robert Weast (ed.), CRC Press, Boca Raton, Florida, v. 61, 1980 Comment: Solution= 1 g salt in 1 liter distilled water

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