dye|World dye variety

Name:C.I.Direct Brown 190,C.I.31750

Molecular Structure: trisazo class

C.I.Direct Brown 190,C.I.31750,748.63,C35H22N6Na2O9S,Formanil Brown R

Molecular Formula:C₃₅H₂₂N₆Na₂O₉S

Molecular Weight: 748.63

CAS Registry Number:

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

Properties and Applications:  red light brown. Soluble in water, ethanol and soluble fiber element, insoluble in other organic solvents. The strong sulfuric acid in the dark for the light blue, diluted red brown for solution, accompanied by precipitation. The dye solution to join 10% sulfuric acid as pale blue light red jujube; Add thick sodium hydroxide solution for blue-ray purplish red color.

List of Suppliers:

Formanil Brown R( American Aniline Products Inc.  )