dye|World dye variety

Name:C.I.Direct Brown 168,C.I.22790

Molecular Structure: Double azo class

C.I.Direct Brown 168,C.I.22790,CAS 6470-19-5,840.59,35H20N6Na4O12S,Benzo Fast Copper Brown TL

Molecular Formula:C₃₅H₂₀N₆Na₄O₁₂S

Molecular Weight: 840.59

CAS Registry Number:6470-19-5

Manufacturing Methods : 2-Amino-5-(4-amino-3-barboxyphenyl)benzoic acid double nitriding, first with 3-Methyl-1-phenyl-1H-pyrazol-5(4H)-one coupling, and then and 3,5-Dihydroxy-7-sulfo-2-naphthoic acid coupling.

Properties and Applications: black light brown. Soluble in water for purplish red, slightly soluble in alcohol. The strong sulfuric acid for violet black, diluted is shallow brown. The dye solution to join strong hydrochloric acid for chocolate brown, have precipitation; Add thick sodium hydroxide solution for dark brown.

List of Suppliers:

Benzo Fast Copper Brown TL( IG Farbenindustrie AG )