Direct Red 56
Name:C.I.Direct Red 56,C.I.23600
Molecular Structure: Double azo class
Molecular Formula:C34H24N6Na4O12S4
Molecular Weight: 928.81
CAS Registry Number:6406-05-9
Manufacturing Methods : 3,3′-Dimethylbenzidine double nitriding, and 3-Aminonaphthalene-2,7-disulfonic acid (2 Moore) coupled.
Properties and Applications: colourful red blue light. Soluble in water for palm light orange to red, slightly soluble in alcohol. The strong sulfuric acid for blue, orange to red light after dilute for brown. Dye with strong hydrochloric acid solution for orange brown, have precipitation; Add thick sodium hydroxide solution for palm to red light orange, precipitation.
Standard | Acid Resistance | Alkali Resistance | Light Fastness | Soaping | Water | ||
Fading | Stain | Fading | Stain | ||||
ISO | 2-3 | 4 | 2 | 1 | 1 |
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