dye|World dye variety

Name:C.I.Direct Red 90,C.I.28170

Molecular Structure: Double azo class

C.I.Direct Red 90,C.I.28170,CAS 5873-24-5,689.63,C30H21N5Na2O8S2

Molecular Formula:C₃₀H₂₁N₅Na₂O₈S₂

Molecular Weight: 689.63

CAS Registry Number:5873-24-5

Manufacturing Methods : 4-Aminobenzenesulfonic acid diazo, and O-Methylaniline coupling, its product to diazo, and 7-Amino-4-hydroxynaphthalene-2-sulfonic acid coupling.

Properties and Applications:  blue-ray red. Soluble in water for red light purple. The strong sulfuric acid for blue, red after diluted precipitation. The dye solution to join strong hydrochloric acid have dark purple precipitation; Add sodium hydroxide have red light purple precipitation.

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