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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. If heated quickly, it melts at 101.5 0C, anhydrous oxalic acid melts at 180 0C.
Application: Precipitating agent in Rare-earth mineral processing; Bleaching agent in the textile activities, wood pulp bleaching; Rust remover for Metal treatment; Used in commercial rust removers to remove rust stains from tubs and sinks. Grinding agent, such as marble polishing, Waste water treatment, removing calcium in water; Use in cleaning and sterilizing homebrewing equipment; Used as a reducing agent for photography and ink removal; Used as purifying agent in pharmaceutical industry; Rock collectors, clean mineral specimens; Remove food and rust stains from kitchen countertops, plumbing fixtures and fabric; Purifying agent in pharmaceutical industry, special in antibiotic medication, such as Oxytetracycline , Chloramphenicol, etc;