Name:C.I.Direct Brown 190,C.I.31750
Molecular Structure: trisazo class
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.
|Standard||Acid Resistance||Alkali Resistance||Light Fastness||Soaping||Water|
List of Suppliers:
Formanil Brown R( American Aniline Products Inc. )