Used in metal cleaning, leather tanning, and textile dyeing. It also serves in pharmaceutical synthesis, rare earth separation, and rust removal. In laboratories, it’s a standard reagent for calcium precipitation.

Toxic if ingested; corrosive to skin and eyes. Handle with gloves and avoid inhalation.

Supplied in 25 kg paper or polyethylene bags. Store in a cool, dry, and well-ventilated area away from oxidizers.