... water,poison. 2.purity:60%,iron:30ppm,50ppm,80ppm,150ppm 3.purity:52%,iron:20ppm,50ppm,150ppm Appearance: Thin ... flakes-purity:60%,iron:1500ppm2. Yellow flakespurity:60%,iron:30ppm,50ppm,80ppm,150ppm purity:52%,iron:20ppm,50ppm,150ppmApplication:Used ... as making sulphur dyestuff intermediate reducer, mordant, flotation agent, depilatory for leather, ...