... 3.10ppm, 20ppm,30ppm,80ppm,150ppm,1500ppm 4.100% gurantee sodium sulfideyellow or red flakes 10ppm,20ppm,30ppm,80ppm,150ppm,1500ppmMolecular ... bagsUsage:used as making sulphur dyestuff intermediate reducer,mordant,flotation agent,depilatory for leather,digestion auxiliary in paper-making also widely ... %max.2.00%max.2.00%max.ColourYellowRED na2s good quality sodium sulfide