Preparation
4-(Phenyldiazenyl)benzenamine diazotization, and 7-Hydroxynaphthalene-1,3,6-trisulfonic acid coupling.
Properties and Applications
red. Soluble in water for red, slightly soluble in alcohol for magenta. In concentrated sulfuric acid to purple, dilution after pink. Dye aqueous solution to join concentrated hydrochloric acid to red; With strong caustic for brown. Used for alcohol soluble varnish color.
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Standard
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Light Fastness
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Heat-resistant(℃)
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water
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Sodium Carbonate(5%)
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Hydrochloric acid(5%)
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Melting point
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Stable
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ISO
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180
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