dye|World dye variety

Name:C.I.Direct Brown 185,C.I.22855

Molecular Structure: Double azo class

C.I.Direct Brown 185,C.I.22855,CAS 6375-50-4,578.46,C25H16N4Na2O8S,Chrome Soga Orange 29451

Molecular Formula:C₂₅H₁₆N₄Na₂O₈S

Molecular Weight: 578.46

CAS Registry Number:6375-50-4

Manufacturing Methods : 2-Amino-5-(4-aminophenyl)benzenesulfonic acid double nitriding, Followed by coupling with  2-Hydroxybenzoic acid and Resorcinol coupling.

Properties and Applications: red light brown. Soluble in water for yellow orange, slightly soluble in alcohol. The strong sulfuric acid to red light purple, diluted for brown. The dye solution to join strong hydrochloric acid for orange brown, have precipitation; With strong sodium hydroxide solution for red orange brown.

List of Suppliers:

Chrome Soga Orange 29451( IG Farbenindustrie AG )