Reactive Red 23

Preparation

2-(3-Amino-4-methoxyphenylsulfonyl)ethyl hydrogen sulfate diazo, and 3-Hydroxynaphthalene-2,7-disulfonic acid coupling, and then into copper complex.

Properties and Applications

blue light pink to red blue light. Dark red powder. The strong sulfuric acid for purple, diluted into dark orange; In nitric acid for golden brown, diluted into dark red. Water solution is red, with 1 Moore sodium hydroxide is still red, continue to join insurance powder and warm to light yellow, join a boric acid sodium can’t return to its original colour and lustre. Can be used for cotton, viscose, silk, polyamide fiber disseminated, knot dyeing, roll the dye, continuous knot dyeing and printing, printing and dyeing directly.