Preparation
2-Amino-3,4,6-trichlorophenol diazotization, and 4-Amino-5-hydroxynaphthalene-1,3-disulfonic acid coupling.
Properties and Applications
green navy blue. Soluble in water for dark red light blue, slightly soluble in ethanol for red light blue. In concentrated sulfuric acid to blue light gray, dilution after dark purple precipitation. Dye aqueous solution to join concentrated hydrochloric acid with brown precipitation; Join concentrated sodium hydroxide solution for blue light red.
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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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3-4
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6
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4-5
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5
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5
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![4-Amino-5-hydroxy-6-[(2,3,5-trichloro-6-hydroxyphenyl)azo]-1,3-naphthalenedisulfonic acid disodium salt Structure](https://www.chemicalbook.com/CAS/GIF/6222-49-7.gif)