sulphur black BR 200% 1.appearance: black flake crystal with metal gloss. 2.Strength (pionts): 200+5 to standard sample. 3.shade: similar to standard sample up to micro-level. 4.insoluble matter in Na 2 S:¡�0.5% 5.free sulphur content: ¡�0.1% 6.moisture: ¡�4%