StructurePotassium binoxalate (PBO)
CAS No. 127-95-7
EC No. 204-873-0
Synonyms Oxalic acid, monopotassium salt; Ethanedioic acid, monopotassium salt; Potassium Quadroxalate; Acetosella salt; Oxalic acid, hemipotassium salt; Potassium Hydrogen Oxalate; Potassium Bioxalate

Potassium binoxalate (PBO)

Potassium binoxalate (PBO), also knowns as potassium hydrogenoxalate, is one of the most common salts of the hydrogenoxalate anion, and can be obtained by reacting potassium hydroxide with oxalic acid.


  • photography
  • marble polishing
  • to remove ink stains

Commercially the product is also called: Salt of sorrel, sorrel salt, sel d'oseille, sal acetosella;

Shelf Life

Under proper storage conditions, the shelf life is 12 months

Health & Safety

Detailed information on the product described can be found in our relevant Health and Safety Information (Material Safety Data Sheet)