red. Soluble in hot water for red, slightly soluble in cold water and ethanol. The strong sulfuric acid to red light purple, diluted precipitation is brown; In nitric acid solution for yellow brown; In a dilute sodium hydroxide solution for yellow brown solution. In water solution to join hydrochloric acid with brown precipitation; Add sodium hydroxide solution to become yellow.
|
Standard
|
Light Fastness
|
Soaping
|
Persperation Fastness
|
Oxygen bleaching
|
Fastness to seawater
|
|
Fading
|
Stain
|
Fading
|
Stain
|
Fading
|
Stain
|
|
ISO
|
2-3
|
2
|
1
|
3
|
1
|
1
|
2
|
3
|
![sodium 5-[(2-hydroxynaphthyl)azo]naphthalenesulphonate Structure](/CAS/GIF/5850-93-1.gif)