Preparation
2-Amino-5-nitro-N-ethylbenzenesulfonanilide diazo, and 6-Amino-4-hydroxynaphthalene-2-sulfonic acid?in acid conditions coupled, then?the product was then reducing the nitro group to an amino group with sodium.
Properties and Applications
dark red light purple. Soluble in water and ethanol for product red. The strong sulfuric acid for yellow brown, after dilute for pink. Its water solution to join strong hydrochloric acid for red; Add thick sodium hydroxide solution for ruby red colour.
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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
|
|
Fading
|
Stain
|
Fading
|
Stain
|
Fading
|
Stain
|
|
ISO
|
5
|
3
|
1
|
4
|
2
|
1
|
4
|
2
|
|
AATCC
|
5
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3
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3
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3
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1
|
1
|
3
|
3
|
![disodium 6-amino-5-[(4-amino-2-sulphonatophenyl)azo]-4-hydroxynaphthalene-2-sulphonate Structure](https://www.chemicalbook.com/CAS/GIF/6360-09-4.gif)