dye|World dye variety

Name:C.I.Direct Brown 138,C.I.31500

Molecular Structure: trisazo class

C.I.Direct Brown 138,C.I.31500,CAS 6428-63-3,567056,C24H22N11NaO3S,Diazo Brown SR

Molecular Formula:C₂₄H₂₂N₁₁NaO₃S

Molecular Weight: 567056

CAS Registry Number:6428-63-3

Manufacturing Methods : N-(3-aminophenyl)formamide diazo, and 2,4-Diaminobenzenesulfonic acid coupling, hydrolysis amino acylation, product double nitriding, and Benzene-1,3-diamine (2 Moore) coupled.

Properties and Applications:  red light brown. Soluble in water for orange brown, slightly soluble in alcohol. The strong sulfuric acid for ash to violet black, yellow to orange for diluted brown. The dye solution to join strong hydrochloric acid have dark brown precipitation; Add thick sodium hydroxide solution for orange brown; Add 10% sulfuric acid don’t change; Add 10% sodium hydroxide solution micro to become red.

List of Suppliers:

Diazo Brown SR ( Bayer Group )