5 uses of sorrel salt at home. Sorrel salt, or oxalic acid, is an organic compound with the formula C2H2O4.
This acid was extracted and isolated in the 18th century via sorrel ( Oxalis acetosella ), hence its name. It is also found naturally in spinach, rhubarb or beets. The main properties of this white crystalline powder, to be diluted in water, are its superior whitening and cleaning capabilities.