4-(Phenyldiazenyl)phenol?and sulfur and Sodium sulfide or Sodium hydroxide in 180 ~ 200 ℃ or 250 ℃ calcination, add or do not add Copper sulfate monohydrate all can.
Properties and Applications
dark blue light green. Part of the soluble in water. In the Sodium sulfide solution for yellow green, In the Sodium hydroxide solution for yellow green.