dye|World dye variety

Name:C.I.Direct Blue 21,C.I.23710

Molecular Structure: Double azo class

C.I.Direct Blue 21,C.I.23710,CAS 6420-09-3,843.75,C34H24N5Na3O11S3

Molecular Formula:C₃₄H₂₄N₅Na₃O₁₁S₃

Molecular Weight: 843.75

CAS Registry Number:6420-09-3

Manufacturing Methods : 3,3′-Dimethylbenzidine double nitriding, in alkaline conditions and 4-Amino-5-hydroxynaphthalene-2,7-disulfonic acid coupling, and then and 4-Hydroxynaphthalene-1-sulfonic acid coupling.

Properties and Applications: dark red to blue light blue. Soluble in water for the navy, slightly soluble in ethanol is shallow purple, slightly soluble in soluble fiber element, insoluble in other organic solvents. The strong sulfuric acid in blue, diluted red for purple; In the nitric acid blue, to brown. The dye solution to join strong hydrochloric acid for purple, precipitation; Add thick sodium hydroxide solution for wine red, have precipitation.

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