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.
Synonyms and Related Terms
salts of lemon (incorrect); salt of sorrel; potassium quadoxalate; sal acetosella
Soluble in water. Insoluble in ethanol. Decomposes when heated.
|Composition||KHC2O4 - H2C2O4|
|Molecular Weight||mol. wt. = 254.2|
Hazards and Safety
Toxic by ingestion.
Mallinckrodt Baker: MSDS
Sources Checked for Data in Record
- 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