4-Amino-3-hydroxynaphthalene-1-sulfonic acid diazo, and Naphthalen-2-ol coupling, and then translate into 1:2 cobalt complex.
Properties and Applications
blue purple. Soluble in water and in the ethanol is purple. The strong sulfuric acid in blue, purple and blue light is diluted with brown precipitation. In water solution to join hydrochloric acid for purple, add sodium hydroxide for blue-ray red.
