Preparation
O-Methylaniline (0.15 Moore) and 4-Aminonaphthalene-1-sulfonic acid (0.85 Moore) diazo, and 6-Hydroxynaphthalene-2-sulfonic acid (0.25 Moore) and 7-Hydroxynaphthalene-1-sulfonic acid?(0.85 Moore) coupled.
Properties and Applications
red. Soluble in water, slightly soluble in ethanol for red orange. The strong sulfuric acid for red purple, diluted for pink. In water solution to join strong hydrochloric acid for red orange; Add thick sodium hydroxide solution for yellow orange.
