... oxides-like odour. Industry Standard: Oxialic AcidProperties: Oxalic acid forms fine colourless crystals, readily soluble in water, ... with light nitrogen oxides-like odour. Oxalic acid dihydrate begins to dissociate at temperature over 30 0C ... , it melts at 101.5 0C,anhydrous oxalic acid melts at 180 0C.Applications: Purifying agent in ... waterproof and avoid water, solarization; Oxalic Acid 99.6%