Preparation
4-Amino-5-hydroxynaphthalene-2,7-disulfonic acid diazotization, and 8-(Phenylamino)naphthalen-1-ol coupling.
Properties and Applications
red light blue. Soluble in water is purple, soluble in Cellosole, slightly soluble in ethanol for red light blue, insoluble in other organic solvent. In concentrated sulfuric acid for SAP green, dilution after blue; In concentrated nitric acid for chestnut, and then into orange. Dye aqueous solution to join concentrated hydrochloric acid for blue; Join concentrated sodium hydroxide solution for red orange brown. Used in paint and ballpoint ink
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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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Poor
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195-225
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