Preparation
3,3′-Dimethoxylbenzidine double nitriding, first with 4-Hydroxynaphthalene-1-sulfonic acid coupling, then with?4-Hydroxynaphthalene-2,7-disulfonic acid coupling.
Properties and Applications
blue. Soluble in water for deep purple, soluble in ethanol. The strong sulfuric acid for Tracy in blue, and in purple for diluted. The dye solution to join strong hydrochloric acid for purple, have precipitation; Add thick sodium hydroxide solution into product red.
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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3
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2
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1-2
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1
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