dye|World dye variety

Name:C.I.Direct Black 49,C.I.34155

Molecular Structure: trisazo class

C.I.Direct Black 49,C.I.34155,CAS 6473-15-0,873.71,C37H22N7Na3O11S2

Molecular Formula:C₃₇H₂₂N₇Na₃O₁₁S₂

Molecular Weight: 873.71

CAS Registry Number:6473-15-0

Manufacturing Methods : 5-Amino-2-hydroxybenzoic acid diazo, and Naphthalen-1-amine coupling, again diazo, in alkaline conditions and 6-Amino-4-hydroxynaphthalene-2-sulfonic acid  coupling, product to diazo, in alkaline conditions and 7-Amino-4-hydroxynaphthalene-2-sulfonic acid coupling.

Properties and Applications: blue gray. Soluble in water for blue purple. In the dark for the strong sulfuric acid, after diluted blue-ray black precipitation. The dye solution to join strong hydrochloric acid blue precipitation; Add thick sodium hydroxide solution to blue.

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