Mordant violet 40 (C.I. 14745)

Preparation

2-Amino-4-chlorophenol diazotization, and 4-Hydroxynaphthalene-1-sulfonic acid coupling.

Properties and Applications

dark purple. Soluble in water for red, soluble in ethanol for titian. In concentrated sulfuric acid for blue purple, red after diluted solution, and then a brick red precipitation. Dye aqueous solution to join concentrated hydrochloric acid to red; Join concentrated sodium hydroxide solution for orange.