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Black powder. Insoluble in water. Dissolved in sodium sulfide solution into dark yellow green leuco. Dissolved in concentrated sulfuric acid purplish blue diluted black precipitate generated.


Mainly used for dyeing cotton and linen. By p-nitrosophenol and o-toluidine condensation with sodium polysulfide sulfide after air oxidation process. Because of the different production process, the product may have different color. Domestic production of sulfide blue BN (Qing Guang), RN (Hong Guang), BRN (Qing Hongguang) three.