dye|World dye variety

Name:C.I.Direct Blue 42,C.I.22505

Molecular Structure: Double azo class

C.I.Direct Blue 42,C.I.22505,CAS 6426-71-7,713.65,C32H21N5Na2O8S2

Molecular Formula:C₃₂H₂₁N₅Na₂O₈S₂

Molecular Weight: 713.65

CAS Registry Number:6426-71-7

Manufacturing Methods :  4-(4-Aminophenyl)benzenamine double nitriding, and 7-Hydroxynaphthalene-1-sulfonic acid coupling, and then in alkaline conditions and 4-Amino-5-hydroxynaphthalene-1-sulfonic acid coupling.

Properties and Applications: red light blue. Soluble in water for violet blue, soluble in alcohol for red light purple. The strong sulfuric acid for blue, purple precipitation after diluted. The dye solution to join hydrochloric acid for blue; Add sodium hydroxide solution for red light purple.

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