dye|World dye variety

Name:C.I.Direct Red 120,C.I.25275

Molecular Structure: Double azo class

C.I.Direct Red 120,C.I.25275,CAS 6391-27-1,786.70,C33H24N8Na2O9S2,Diazorubin B

Molecular Formula:C₃₃H₂₄N₈Na₂O₉S₂

Molecular Weight: 786.70

CAS Registry Number:6391-27-1

Manufacturing Methods : N,N’-bis(3-aminophenyl)urea double nitriding, in alkaline conditions and 7-Amino-4-hydroxynaphthalene-2-sulfonic acid (2 Moore) coupled.

Properties and Applications: Claret. Soluble in water for orange brown, soluble in ethanol for orange. In the strong sulfuric acid to red, shallow orange for diluted. The dye solution to join strong hydrochloric acid for red orange brown, have precipitation; Add thick sodium hydroxide solution for orange brown, have precipitation; Add 10% sodium hydroxide solution color micro become yellow.

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