dye|World dye variety

Name:C.I.Direct Black 77,C.I.35860

Molecular Structure: Multi-azo class

C.I.Direct Black 77,C.I.35860,CAS 6409-85-4,1143.94,C42H25N11Na4O15S4

Molecular Formula:C₄₂H₂₅N₁₁Na₄O₁₅S₄

Molecular Weight: 1143.94

CAS Registry Number:6409-85-4

Manufacturing Methods : 2-Aminobenzene-1,4-disulfonic acid diazo, and Naphthalen-1-amine coupling, again diazo, and 8-Aminonaphthalene-2-sulfonic acid coupling, product to diazo, in alkaline conditions and 4-Amino-5-hydroxynaphthalene-1-sulfonic acid coupling, and then diazo, and 4-Nitrobenzene-1,3-diamine coupling.

Properties and Applications: green light grey. water-soluble ash light black, soluble in ethanol. The strong sulfuric acid for gray light black, grey brown for purple diluted. Dye with strong hydrochloric acid solution for violet black, precipitation; Add thick sodium hydroxide solution for Gray light black, precipitation.

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