Chemical Properties
Soluble in water, the aqueous solution is magenta color, add concentrated hydrochloric acid is date red; add concentrated sodium hydroxide solution, produce burgundy precipitate. Very soluble in ethanol is lavender. In concentrated sulfuric acid is purple-black, diluted to orange to reddish brown.
Preparation
2 Moore 3-Amino-4-methoxybenzenesulfonic acid diazo, and N,N’-bis(4-hydroxy-2-sulfonaphthalene-7-yl)urea coupling, then ammoniacal copper sulfate solution, to convert it into copper complexes in the complexation of the two methoxy groups are replaced by hydroxyl groups..
Properties and Applications
blue and red to red light purple.
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Standard(cotton)
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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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4-5
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2-3
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7
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2-3(40℃)
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2-3
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3-4
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3-4
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![tetrasodium [mu-[[7,7'-(carbonyldiimino)bis[4-hydroxy-3-[(2-hydroxy-5-sulphophenyl)azo]naphthalene-2-sulphonato]](8-)]]dicuprate(4-) Structure](https://www.chemicalbook.com/CAS/GIF/15418-16-3.gif)