Preparation
4-(4-Aminophenyl)benzenamine double nitriding, first coupled with 2-Hydroxybenzoic acid, and then in alkaline conditions and 6-(Dimethylamino)-4-hydroxynaphthalene-2-sulfonic acid coupling.
Properties and Applications
brown. Soluble in water for dark brown, soluble in ethanol for dark orange brown. The strong sulfuric acid as dark blue light in purple, for after diluted purplish red, red brown precipitation. The dye solution to join 10% sulfuric acid as dark blue light red; Add thick sodium hydroxide solution for red light orange brown.
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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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2
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4-5
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3
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2-3
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2-3
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AATCC
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4
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5
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3-4
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2-3
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2-3
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![Benzoic acid, 5-[[4'-[[7-(dimethylamino)-1-hydroxy-3-sulfo-2-naphthalenyl]azo][1,1'-biphenyl]-4-yl]azo]-2-hydroxy-, disodium salt Structure](https://www.chemicalbook.com/CAS/20200401/GIF/6426-59-1.gif)