Preparation
5-Aminonaphthalene-1-sulfonic acid (2 Moore) diazo, coupled with N,N’-bis(4-hydroxy-2-sulfonaphthalene-7-yl)urea.
Properties and Applications
blue-ray red. Soluble in water for product red, soluble in ethanol is shallow dark pink. The strong sulfuric acid for purple, diluted for pink. The dye solution to join strong hydrochloric acid have article red precipitate; Add thick sodium hydroxide solution for 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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4-5
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4-5
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2
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1-2
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1-2
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![tetrasodium 5,5'-[carbonylbis[imino(1-hydroxy-3-sulphonatonaphthalene-2,6-diyl)azo]]bisnaphthalene-1-sulphonate Structure](https://www.chemicalbook.com/CAS/GIF/6410-42-0.gif)