2-Formyl-5-hydroxybenzenesulfonic acid?(1 Moore) and 3-(Ethyl(phenyl)amino)methyl)benzenesulfonic acid (2 Moore) condensation, oxidation, and then into aluminum salt deposit color.
Properties and Applications
blue light green. Soluble in water for blue light green, soluble in ethanol for blue light green. The strong sulfuric acid for dark orange, diluted dark for; In strong hydrochloric acid or nitric acid are all the orange solution; In 10% of sodium hydroxide solution for light blue.
