C.I.Sulphur Brown 6

3,6-Dinitro-9H-carbazole and Sodium polysulfide glycerol in the presence of heating.

brown. Part of the soluble in water. In hydrochloric acid in red brown precipitation; In concentrated sulfuric acid to dark brown solution, precipitation, dilution after yellow brown precipitation; In the Sodium hydroxide solution for brown; In the Sodium sulfide solution for brown.