3-Amino-2-hydroxy-5-sulfobenzoic acid diazotization, and 5-Aminonaphthalene-2-sulfonic acid coupling, product and diazotization, coupled with 2-Hydroxybenzoic acid.
Properties and Applications
red light brown. Soluble in water for golden orange, insoluble in alcohol. In concentrated sulfuric acid to green light blue, after dilution to golden brown. Dye aqueous solution with concentrated hydrochloric acid for yellow brown to olive; Join concentrated sodium hydroxide solution for purple.
