Laundry sour

A laundry sour is a chemical added to clothing during the final rinse cycle of a washing machine to lower the pH of the water and to assist with the removal of detergents and rust stains. Most such sours are fluoride-based, including ammonium silicofluoride, ammonium bifluoride, and hydrofluosilicic acid; glycolic acid is also used.[1] The US Department of Defense recognizes two "types" of laundry sours: type I is sodium silicofluoride and sodium acid fluoride in powdered, crystal, or flake form; type II is ammonium bifluoride in flake form.[2]

References
  1. Harry Bennett (1939). The Chemical Formulary. Chemical Publishing Company. p. 517.
  2. United States Dept. of Defense of Defense (1970). Military Standard, Issues 1472-1499. The Department. p. 8.
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