dye|World dye variety

Name:C.I.Direct Blue 23,C.I.24405

Molecular Structure: Double azo class

C.I.Direct Blue 23,C.I.24405,CAS 6771-79-5,966.86,C40H29N6Na3O13S3,Naphthamine Blue TBF

Molecular Formula:C₄₀H₂₉N₆Na₃O₁₃S₃

Molecular Weight: 966.86

CAS Registry Number:6771-79-5

Manufacturing Methods : 3,3′-Dimethoxylbenzidine double nitriding, first in alkaline conditions and 4-Amino-5-hydroxynaphthalene-2,7-disulfonic acid, and then in three alkaline conditions and 4-Hydroxy-7-(phenylamino)naphthalene-2-sulfonic acid coupling.

Properties and Applications: blue. Soluble in water for blue, soluble in soluble fiber element, slightly soluble in ethanol as a pale red purple, insoluble in other organic solvents. The strong sulfuric acid for green light blue, diluted red to blue for purple. The dye solution to join strong hydrochloric acid for dark purple, have precipitation; Add thick sodium hydroxide solution for dark purple, have precipitation.

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