Preparation
2-Hydroxy-3-(4-aminobenzamido)-5-sulfobenzoic acid?diazo, and a coupling?m-Toluidine, then the light gasification.
Properties and Applications
red light yellow. Soluble in water for golden yellow, not soluble in alcohol. The strong sulfuric acid for quality in red, Gray light purple for diluted. The dye solution to join strong hydrochloric acid purple black sediment: add thick sodium hydroxide solution for gold orange, used for the cellulose fibre, silk dyeing, paper color.
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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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4
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6
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3-4
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3
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![tetrasodium 3,3'-[carbonylbis[imino(2-methyl-4,1-phenylene)azo-4,1-phenylenecarbonylimino]]bis[5-sulphonatosalicylate] Structure](https://www.chemicalbook.com/CAS/GIF/6420-28-6.gif)