Preparation
4-Aminonaphthalene-1-sulfonic acid diazo, and 7-Hydroxynaphthalene-1,3,6-trisulfonic acid coupling.
Properties and Applications
colourful red blue light. Soluble in water for wine red, hardly soluble in alcohol. The strong sulfuric acid for purple, diluted for pink. Adding strong hydrochloric acid solution for wine red; Add sodium hydroxide for red brown.
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Standard
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Light Fastness
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Soaping
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Persperation Fastness
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Oxygen bleaching
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Fastness to seawater
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Fading
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Stain
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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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2-3
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2-3
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2
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1
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2-3
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