dye|World dye variety

Name:C.I.Direct Red 220,C.I.29225

Molecular Structure: Double azo class

C.I.Direct Red 220,C.I.29225,CAS 15418-16-3,992.76,C33H20N6Na4O17S4

Molecular Formula:C₃₃H₂₀N₆Na₄O₁₇S₄

Molecular Weight: 992.76

CAS Registry Number:15418-16-3

Manufacturing Methods :  2 Moore 3-Amino-4-methoxybenzenesulfonic acid diazo, and N,N’-bis(4-hydroxy-2-sulfonaphthalene-7-yl)urea coupling, then ammoniacal copper sulfate solution, to convert it into copper complexes in the complexation of the two methoxy groups are replaced by hydroxyl groups..

Properties and Applications: blue and red to red light purple.

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