dye|World dye variety

Name:C.I.Direct Brown 58,C.I.22340

Molecular Structure: Double azo class

C.I.Direct Brown 58,C.I.22340,CAS 6426-59-1,655.59,C31H23N5Na2O7S,Diphenyl Brown BN

Molecular Formula:C₃₁H₂₃N₅Na₂O₇S

Molecular Weight: 655.59

CAS Registry Number:6426-59-1

Manufacturing Methods : 4-(4-Aminophenyl)benzenamine double nitriding, first coupled with 2-Hydroxybenzoic acid, and then in alkaline conditions and 6-(Dimethylamino)-4-hydroxynaphthalene-2-sulfonic acid coupling.

Properties and Applications: brown. Soluble in water for dark brown, soluble in ethanol for dark orange brown. The strong sulfuric acid as dark blue light in purple, for after diluted purplish red, red brown precipitation. The dye solution to join 10% sulfuric acid as dark blue light red; Add thick sodium hydroxide solution for red light orange brown.

List of Suppliers:

Diphenyl Brown BN( Geigy Co. Ltd )