... 2BR sulphur black we provide sulphur black,sodium chlorate,sodium chlorite,potassium chlorateand potassium perchlorate sulphur blackProdcut ... the rest being inert substances such as sodium chloride, sodium sulfate, sodium carbonate,sugar Physical and Chemical PropertiesFormsolidColoura) powder ... to standardMoisture6.0% max.Insoluble matter in sodium sulphide0.7% max.Free sulphur content0.5% ...