StructurePotassium tetraoxalate (PTO)
CAS No. 6100-20-5
EC No. 204-874-6
Synonyms Potassium tetroxalate; Potassium trihydrogen dioxalate dihydrate; Acetosella salt; Oxalic acid hemipotassium salt

Potassium tetraoxalate (PTO)

Potassium tetraoxalate (PTO), also known as potassium hydrogenoxalate, is one of the most common salts of the hydrogenoxalate anion. Potassium tetraxolate (PTO) can be obtained by reacting potassium hydroxide with oxalic acid Commercially the product is also called: Salt of sorrel, sorrel salt, sel d'oseille, sal acetosella;


  • It is a commercial product, used in photography, marble polishing and to remove ink stains

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).