Preparation
2-Amino-5-(4-aminophenyl)benzenesulfonic acid double nitriding, first and 4-Aminobenzenesulfonic acid diazo, and Benzene-1,3-diamine coupled to a product matches, then in alkaline conditions and 6-Amino-4-hydroxynaphthalene-2-sulfonic acid? coupling.
Properties and Applications
red light brown. Soluble in water for red orange brown. The strong sulfuric acid in grey or black for purple, for brown after diluted. The dye solution to join strong hydrochloric acid for brown, have precipitation; Add thick sodium hydroxide solution for orange brown.
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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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2
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4
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3
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2
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2
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