dye|World dye variety

Name:C.I.Direct Brown 56,C.I.22040

Molecular Structure: Double azo class

C.I.Direct Brown 56,C.I.22040,CAS 6486-31-3,575.57,C28H22N7NaO4S

Molecular Formula:C₂₈H₂₂N₇NaO₄S

Molecular Weight: 575.57

CAS Registry Number:6486-31-3

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

Properties and Applications: dark red light brown to dark red. Soluble in water for red, and adequate soluble in alcohol. The strong sulfuric acid for hidden cyan, diluted red for sauce. The dye solution to join strong hydrochloric acid for red sauce, precipitation; Add thick sodium hydroxide solution for orange brown, have precipitation.

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