Red and Yellow Flakes,Fe:1500ppm,150ppm, 80ppm,50ppm,30ppm,20ppm,10ppm ... and ISO9001:2008, is a leading manufacture & exporter of Sodium Sulphide in China.Uses: Mainly used in drug, food, ferment, ... Property: Solid-fused, brown red color flakes or light yellow crystalline small crystal flakes, with SO2 ordor, soluble in water, ... 2MaxFe(%)0.001Max/0.0005Max manufacturer HIGH QUALITY Sodium Sulphide flakes