Preparation
3-(4-Amino-2-sulfophenylamino)-2,3-dioxopropanoic acid diazo, and Naphthalen-1-amine coupling, product to diazo, in alkaline conditions and 7-Amino-4-hydroxynaphthalene-2-sulfonic acid coupling, and then 2-(4-Aminophenylamino)-2-oxoacetic acid hydrolysis base.
Properties and Applications
red light blue. Soluble in water for darkness purplish red color, soluble in ethanol for purple. The strong sulfuric acid for blue-ray green, diluted for purple. The dye solution to join strong hydrochloric acid has the purple precipitation; Add thick sodium hydroxide solution for red sauce, 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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5
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5
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3
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3
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3-4
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![7-Amino-3-[[4-[(4-amino-3-sodiosulfophenyl)azo]-1-naphthalenyl]azo]-4-hydroxynaphthalene-2-sulfonic acid sodium salt Structure](https://www.chemicalbook.com/CAS/GIF/6226-99-9.gif)