Preparation
4-(4-Aminophenyl)benzenamine double nitriding, in alkaline conditions and 7-Amino-4-hydroxynaphthalene-2-sulfonic acid coupling, and?3-Hydroxybenzenesulfonic acid coupling.
Properties and Applications
colourful red blue light. Soluble in water for red, and adequate soluble in alcohol. The strong sulfuric acid for purple to blue, Red sauce for diluted. Dye with strong hydrochloric acid solution for the red light purple purple, precipitation; Add thick sodium hydroxide solution for big red, precipitation.
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Standard
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Acid Resistance
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Alkali Resistance
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Light Fastness
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Soaping
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Water
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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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2
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1-2
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1
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AATCC
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3
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3-4
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2
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2
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1
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![7-Amino-4-hydroxy-3-[[4'-[(4-hydroxy-2-sodiosulfophenyl)azo]-1,1'-biphenyl-4-yl]azo]naphthalene-2-sulfonic acid sodium salt Structure](https://www.chemicalbook.com/CAS2/GIF/6375-58-2.gif)