Preparation
2,5-Dichlorobenzenamine diazo, and 4-Amino-5-hydroxynaphthalene-2,7-disulfonic acid?in acid conditions coupled, its product again with diazo of Naphthalen-1-amine in alkaline conditions coupled.
Properties and Applications
Dark blue light green. Soluble in water for blue light green, and partly dissolved in ethanol. The strong sulfuric acid for blue-ray black, diluted change to blue. The dye solution to join strong hydrochloric acid for blue-ray green; Add thick sodium hydroxide solution for red light blue.
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Standard
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Light Fastness
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Soaping
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Persperation Fastness
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Oxygen bleaching
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Fastness to seawater
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Fading
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Stain
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Fading
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Stain
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Fading
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Stain
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ISO
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3
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3
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5
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4
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4
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2
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4
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5
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![disodium 4-amino-3-[(2,5-dichlorophenyl)azo]-5-hydroxy-6-(1-naphthylazo)naphthalene-2,7-disulphonate Structure](https://www.chemicalbook.com/CAS/GIF/5850-34-0.gif)