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Direct Violet 21

Name:C.I.Direct Violet 21,C.I.23520

Molecular Structure: Double azo class

C.I.Direct Violet 21,C.I.23520,CAS 6470-45-7,725.70,C34H25N5Na2O7S2,Brilliant Pink IR,Triasol Pink IR

C.I.Direct Violet 21,C.I.23520,CAS 6470-45-7,725.70,C34H25N5Na2O7S2,Brilliant Pink IR,Triasol Pink IR

Molecular Formula:C34H25N5Na2O7S2

Molecular Weight: 725.70

CAS Registry Number:6470-45-7

Manufacturing Methods :  3,3′-Dimethylbenzidine double nitriding, first with 4-Aminonaphthalene-1-sulfonic acid matches, again with 4-Hydroxynaphthalene-1-sulfonic acid coupling. In some brands are available in 6-Aminonaphthalene-1-sulfonic acid instead of 4-Hydroxynaphthalene-1-sulfonic acid.

Properties and Applications: dark red light purple. Soluble in water for Red sauce, soluble in ethanol for product Red. The strong sulfuric acid for blue, blue for red after diluted. The dye solution to join strong hydrochloric acid for hidden cyan, have precipitation; Add thick sodium hydroxide solution for red wine.

Standard Acid Resistance Alkali Resistance Light Fastness Soaping Water
Fading Stain Fading Stain
ISO 1 3 2 1-2 1-2

List of Suppliers:

Arlindone Brilliant Pink IR Extra (ARL)

Triasol Pink IR(Chemische Fabriek Triade BV)


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