... Sulphide/Sodium Sulfuret flake Molecular formula: Na2SAppearance: Thin flakes, yellow or red, soluble water, presenting strong alkaline solution, ... Red flakes-purity:60%,iron:1500ppm2. Yellow flakes purity:60%,iron:30ppm,50ppm,80ppm,150ppm purity:52%,iron:20ppm,50ppm,150ppm Sodium ... , digestion auxiliary in paper-making also widely used in pigment and rubber industry, etc. Packing: 25kgs net weight/ ...