Appearance : White powder Packing: 25 kg in net PP bag, 20MT in the 20'FCL Uses : It is used as a food additive, leaching agent for textile fibres; Colors stripper and dechlorination; preparation of Indigo Vat Dye; solubilizing and acidyfing agent for leather industries ;bleaching agent for paper pulps; preservative and sterilisation agent for food industries