Preparation
4-Amino-5-hydroxynaphthalene-2,7-disulfonic acid?diazo, and 5-Aminonaphthalen-1-ol?in acetic acid medium coupling.
Properties and Applications
green light blue. Soluble in water for purple. The strong sulfuric acid in blue, diluted began to change color, and then into a purple. In water solution to join hydrochloric acid colour and lustre is basic unchanged; Add thick sodium hydroxide solution for orange.
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Standard
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Light Fastness
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Soaping
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Persperation Fastness
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Oxygen bleaching
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Fastness to seawater
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Fading
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Stain
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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
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3
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2
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2
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3
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![2,7-Naphthalenedisulfonic acid, 4-[(1-amino-5-hydroxynaphthalenyl)azo]-5-hydroxy-, disodium salt Structure](https://www.chemicalbook.com/CAS/20200401/GIF/1323-94-0.gif)