... Sulfuret flake Molecular formula: Na2SAppearance: Thin flakes, yellow or red, soluble water, presenting strong alkaline solution, easily oxidized ... air, poison. Specification:1. Red flakes-purity:60%,iron:1500ppm2. Yellow flakes purity:60%,iron:30ppm,50ppm,80ppm,150ppm purity:52 ... %,iron:20ppm,50ppm,150ppm Sodium Sulphide: ItemSpec.Fe3 ...