Preparation
3-Aminonaphthalene-1,5-disulfonic acid diazo, and Naphthalen-1-amine coupling, again diazo, and 8-Aminonaphthalene-2-sulfonic acid coupling, product to diazo, in alkaline conditions and 4-Amino-5-hydroxynaphthalene-1-sulfonic acid coupling, and then diazo, and 4-Nitrobenzene-1,3-diamine coupling.
Properties and Applications
brown light grey. Soluble in water for violet to violet black, soluble in ethanol. The strong sulfuric acid for gray and blue-ray gray, diluted gray light purple for. The dye solution to join strong hydrochloric acid for galleries to violet, precipitation; Add thick, hydrogen for violet solution oxidation to violet black, precipitation.
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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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3
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5
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4-5
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2
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2-3
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