Benzo[a]phenazinium,5-hydroxy-7-phenylsulfo-, inner salt, sodium salt (9CI)

Preparation

(a) C.I.Acid Red 103 (C.I. 50090) and water or dilute acids in 160 ~ 180 ℃ under pressure and heat, and thus generate ketone of Turin rose lead single sulfonic acid, and then into sodium salt; (b) C.I.Acid Red 103?(C.I. 50090) heated in a weak alkaline solution, thereby decomposed 4 – amino-isophthalic acid disodium salt.

Properties and Applications

red light orange. Soluble in water for palm orange, soluble in ethanol for gold orange. The strong sulfuric acid for red, diluted into orange. Its water solution to join strong hydrochloric acid for red light brown orange; Add thick sodium hydroxide solution for palm orange. Used for wool, silk, cotton, vinegar fiber etc of fiber dyeing and printing directly.