(a) 4-Aminophenol (or 4-Aminophenol and other compounds) with large excess Sodium sulfide and sulfur in the 180 ~ 210 ℃ heating, (b) Benzene-1,4-diamine and Sodium sulfide and sulfur heating. From other Aminophenol (or Hydroquinone) compounds can also get performance similar black dye.
