2,7-Naphthalenedisulfonic acid, 4-hydroxy-3-(2-naphthalenylazo)-, disodium salt
- CAS NO.：5858-66-2
- Empirical Formula: C20H12N2Na2O7S2
- Molecular Weight: 502.42802
- EINECS: 611-707-4
What is 2,7-Naphthalenedisulfonic acid, 4-hydroxy-3-(2-naphthalenylazo)-, disodium salt?
Preparation
Naphthalen-2-amine diazo, coupled with 4-Hydroxynaphthalene-2,7-disulfonic acid.
Properties and Applications
red. Soluble in water for red, orange for adequate soluble in alcohol. The strong sulfuric acid for dark purple, diluted in red. In aqueous solution to join strong hydrochloric acid for red; Add thick sodium hydroxide solution for orange brown.
| Standard | Light Fastness | Soaping | Persperation Fastness | Oxygen bleaching | Fastness to seawater | |||
| Fading | Stain | Fading | Stain | Fading | Stain | |||
| ISO | 4 | 2-3 | 3 | 2 | 1-2 | 2 | ||
Safety information for 2,7-Naphthalenedisulfonic acid, 4-hydroxy-3-(2-naphthalenylazo)-, disodium salt
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