Acid Violet 7

Appearance is dark red powder. It is soluble in water and blue-red, slightly soluble in ethanol and acetone, insoluble in other organic solvents. It is blue-red in concentrated sulfuric acid and bright red after dilution; it turns orange when concentrated nitric acid is reddish solution When dyeing, it encounters copper and iron ions, and its color is slightly darker, while the latter is slightly shallower; chromium ions have little effect on it.

Use condition:

1. It is used for coloring wool, silk, nylon and leather, paper, soap, wood, medicine and cosmetics, and can also be used for biological dyeing.

2. Wool dyeing should be carried out in a strong acid bath. The pH of the dyeing solution is 2~4, which is suitable for boiling dyeing. The highest dyeing temperature is 95~100°C; silk and nylon dyeing should be carried out in formic acid bath.

3. Blending of blended fabrics: When wool is dyed in the same bath as various fibers, the nylon is colored, the silk is lightly colored, and the cellulose fibers are not stained.

4. It is often used to dye dark brown and deep purple colored yarns, and the leveling property is poor. When dyeing, it can improve the leveling property by controlling the heating rate, adding leveling agent and adjusting the pH to 3~4.