Potassium tetraoxalate

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White, slightly Hygroscopic crystals. Potassium tetroxalate is used as a water soluble source of Oxalic acid for removing of Rust stains and iron gall inks. It is also used as a cleaner for metals and wood, as a Mordant in dyeing and as a photographic chemical.

Chemical structure

Potassium tetroxalate.jpg

Synonyms and Related Terms

salts of lemon (incorrect); salt of sorrel; potassium quadoxalate; sal acetosella


  • Toxic by ingestion.
  • Sigma Aldrich: SDS

Physical and Chemical Properties

  • Soluble in water. Insoluble in ethanol
  • Decomposes when heated.
Composition KHC2O4 - H2C2O4
CAS 127-96-8
Molecular Weight mol. wt. = 254.2

Resources and Citations

  • Susan E. Schur, Conservation Terminology: A review of Past & Current Nomenclature of Materials, Technology and Conservation, Spring (p.34-39); Summer (p.35-38); Fall (p.25-36), 1985
  • Hermann Kuhn, Conservation and Restoration of Works of Art and Antiquities, Butterworths, London, 1986
  • The Merck Index, Susan Budavari (ed.), Merck Research Labs, Whitehouse Station, NJ, 12th Edition, 1996 Comment: entry 7863

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