... Sulfuret flake Molecular formula: Na2SAppearance: Thin flakes, yellow or red, soluble water, presenting strong alkaline solution, easily oxidized when ... exposed to air, poison. Specification:1. Red flakes-purity:60%,iron:1500ppm2. Yellow flakes purity:60%,iron ... Max0.015%Max0.008/0.005%Max0.003%/0.002%Max ApplicationUsed as making sulphur dyestuff intermediate reducer, mordant, ...