... Fast delivery SGS,BV,accepted SpecificationsFlakes, yellow or red color, soluble in water, presenting strong alkaline solution, easily oxidized ... are a leading manufacturer and exporter for sodium sulfide red flake 1500ppm, and yellow flake 150ppm, 50ppm, ... 1849Dangerous Class: 82. Appearance: Thin flakes, yellow or red, soluble water, presenting strong alkaline solution, easily oxidized when exposed ...