Preparation
4-Nitrobenzenamine diazotization, and 2-Hydroxybenzoic acidcoupling ,Reducing the nitro group, and then diazotization, coupling with 2-Hydroxybenzoic acid, and then sulfonated.
Properties and Applications
orange. Soluble in water for golden yellow, not soluble in ethanol. In concentrated sulfuric acid to red light purple, after dilution for green yellow until golden brown. Dye aqueous solution to join concentrated hydrochloric acid for green yellow until golden brown, Join concentrated sodium hydroxide solution for ruby red.
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Standard
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Ironing Fastness
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Light Fastness
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Fulling
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Persperation Fastness
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Soaping
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Water
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Alkali
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Acid
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ISO
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5
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5
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4
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5
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![5,5'-[1,4-Phenylenebis(azo)]bis[2-hydroxy-3-sodiosulfobenzoic acid sodium] salt Structure](https://www.chemicalbook.com/CAS/20211123/GIF/6492-53-1.gif)