... BV,accepted SpecificationsFlakes, yellow or red color, soluble in water, presenting strong alkaline solution, easily oxidized when exposed ... : 82. Appearance: Thin flakes, yellow or red, soluble water, presenting strong alkaline solution, easily oxidized when exposed to air ... 60%minFe: 1500ppm maxNa2CO3: 5.0%maxWater Insoluble: 0.4%max2. Sodium Sulphide yellow flakesNa2S: 60%minFe: 10ppm--150ppmNa2CO3 ...