dye|World dye variety

Name:C.I.Direct Brown 57,C.I.31705

Molecular Structure: trisazo class

C.I.Direct Brown 57,C.I.31705,746.66,C35H24N8Na2O7S

Molecular Formula:C₃₅H₂₄N₈Na₂O₇S

Molecular Weight: 746.66

CAS Registry Number:

Manufacturing Methods : 4-(4-Aminophenyl)benzenamine double nitriding, first coupled with 2-Hydroxybenzoic acid, and then in alkaline conditions and 6-Amino-4-hydroxynaphthalene-2-sulfonic acid  coupling, its product to diazo, and Benzene-1,3-diamine coupling.

Properties and Applications: dark red light brown. Soluble in water for dark red light brown, soluble in ethanol and soluble fiber element, slightly soluble in acetone, insoluble in other organic solvents. The strong sulfuric acid as dark blue light in purple, dilute red after brown precipitation; In 10% of sulfuric acid for blue-ray gray. The dye solution to join 10% sodium hydroxide solution for purplish red color.

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