Preparation
(a) 8-Hydroxynaphthalene-1,3,6-trisulfonic acid alkali fusion; (b),4-Amino-5-hydroxynaphthalene-2,7-disulfonic acid and sodium hydroxide in the pressure response; (c), 4,5-Diaminonaphthalene-2,7-disulfonic acid?and Inorganic acid in aqueous solution under pressure reaction.
Properties and Applications
red light brown. Soluble in water is shallow brown. In concentrated sulfuric acid of colorless, no change after diluted. Dye aqueous solution to join Ferric chloride for grass green.
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Standard
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Ironing Fastness
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Light Fastness
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Fulling
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Persperation Fastness
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Soaping
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Water
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Alkali
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Acid
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ISO
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4
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5-6
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5
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5
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5
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5
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