Alizarin Red S

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A chemical indicator used to detect metallic aluminum. Alizarin Red S is composed of sodium alizarin sulfonate. It reacts with aluminum ions to form a pink-red complex.

Synonyms and Related Terms

sodium alizarin sulfonate


  • Harmful by ingestion.
  • Contact may cause irritation.
  • Fisher Scientific: SDS

Physical and Chemical Properties

Tin and lead produce a dark red complex

Composition C14H8O7S
CAS 130-22-3

Resources and Citations

  • For a description of test procedures see: N.Odegaard, S.Carroll, W.Zimmt, Material Characterization Tests for Objects of Art and Archaeology Archetype Publications, London, 2000, p. 36.
  • Sigma Dyes, Stains and Natural Pigments, Infrared Library, Nicolet, 1991-1995