dye|World dye variety

Name:C.I.Direct Brown 43,C.I.35700

Molecular Structure: Multi-azo class

C.I.Direct Brown 43,C.I.35700,CAS 6471-44-9,1054.93,C44H29N10Na3O12S3

Molecular Formula:C₄₄H₂₉N₁₀Na₃O₁₂S₃

Molecular Weight: 1054.93

CAS Registry Number:6471-44-9

Manufacturing Methods :  4-(4-Aminophenyl)benzenamine double nitriding, first in alkaline conditions and 4-Amino-5-hydroxynaphthalene-2,7-disulfonic acid coupling, again with phenol coupling, product to diazo, and 6-Amino-4-hydroxynaphthalene-2-sulfonic acid  diazo, and Benzene-1,3-diamine coupled to a product matches.

Properties and Applications: dark red light brown. Soluble in water for dark brown. The strong sulfuric acid for purple, diluted for brown. The dye solution to join strong hydrochloric acid darker precipitation; Join into the thick sodium hydroxide solution for brown

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