Acid Green 43

4-Aminobenzenesulfonic acid?(2 Moore) diazo, in the presence of sodium hydroxide with Naphthalen-1-ol?coupling.

: yellow light brown. Soluble in water for red light brown. The strong sulfuric acid for purple, for yellow brown after diluted. In water solution to join hydrochloric acid has the purple precipitation; Add sodium hydroxide is cherry red.