Preparation
3-Aminobenzoic acid diazo, in acid conditions coupled with N,N’-bis(4-hydroxy-2-sulfonaphthalene-7-yl)urea, O-Anisidine diazo, in alkaline conditions and coupled product matches.
Properties and Applications
red. Soluble in water for colourful red, soluble in ethanol Reddish orange. The strong sulfuric acid to red light purple, diluted red for quality. The dye solution to join strong hydrochloric acid have article red precipitate; Add thick sodium hydroxide solution have red light orange brown 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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4-5
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5
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3
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1-2
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1-2
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![Benzoic acid, 3-[[1-hydroxy-6-[[[[5-hydroxy-6-[(2-methoxyphenyl)azo]-7-sulfo-2-naphthalenyl]amino]carbonyl]amino]-3-sulfo-2-naphthalenyl]azo]-, trisodium salt Structure](https://www.chemicalbook.com/CAS/20200401/GIF/6420-42-4.gif)