N/a manufacturer / supplier in China, offering CAS 16721-80-5 Industrial Grade Yellow Flakes Sodium Hydrosulfide 70% Min Nahs 70%, High Purity 70% Sodium Hydrosulphide Flakes Nahs Yellow Flakes CAS 16721-80-5, Sodium Hydrosulphide Flakes 70% Nahs Reagent for Copper Flotation and so on.