sodium sulphide, yellow/ red flakes Characteristics: Flakes, brown-red color, soluble in water, presenting strong alkaline solution, easily oxidized when exposed to air,poison. Molecular formular: Na2S Specification: Na2S 50%/ 60% min Water insolubles: 0.4% max Fe: from 30ppm to1500ppm according to customer's requirement Na2CO3: 5%max Uses: used as making sulphur dyes or dyestuff intermediate reducer, mordant, flotation agent, depllatory for leather, digestion auxiliary in paper-making, also widely used in pigment and rubber industry etc. Standards: GB10500-89 Packing: 25kgs plastic woven bags lined with one layer polythene bags, inside with plastic coating bags