dye|World dye variety

Name:C.I.Mordant Black 25,C.I.21725

Molecular Structure: Double azo class

C.I.Mordant Black 25,C.I.21725,CAS 3258-74-0,638.54,C26H16N4Na2O9S2

Molecular Formula:C₂₆H₁₆N₄Na₂O₉S₂

Molecular Weight: 638.54

CAS Registry Number:3258-74-0

Manufacturing Methods : 3,5-Diamino-4-hydroxybenzenesulfonic acid double nitrogen, add Sodium hydroxide make show weak alkaline, in order to make molecules of chlorine is hydroxyl replaced, then first and 6-Hydroxynaphthalene-2-sulfonic acid coupling, again with Naphthalen-2-ol coupling.

Properties and Applications: blue black. Soluble in water for purple to Copenhagen blue, slightly soluble in ethanol for dark purple, not soluble in Acetone. In concentrated sulfuric acid to deep purple, dilution after brown light orange. Dye aqueous solution to join concentrated hydrochloric acid to brown light orange, Join concentrated sodium hydroxide solution for purple.

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