Direct Violet 12

Application Features

Direct Violet 12 alias direct Qinglian R, direct snow blue R, direct red light green lotus. Appearance is generally dark brown powder, poor water solubility, sensitive to hard water. Dissolved in water is purple black, soluble in alcohol is magenta. It is dark blue in concentrated sulfuric acid, and turns dark purple after dilution. Its aqueous solution is concentrated with hydrochloric acid to have a purple-red to purple-black precipitate, and concentrated sodium hydroxide has a purple-black precipitate.

Use condition:

1. It has been used to dye cotton or viscose fiber to get reddish purple. If diazotized, it can be red-colored navy with 2-naphthol. The dyeing rate is good, the dyeability is poor, and the dyeing is suitable. Slowly heat up and add salt to control the dyeing, and obtain uniform color. After dyeing, the dyeing solution should be naturally cooled to 80 °C, which is good for dye exhaustion.

2. It has also been used to dye rich fiber, the dyeing rate is very good, but the color is slightly yellower than dyed cotton. It has also been used for dyeing or printing silk and its fabric. Because it is slightly sensitive to hard water, it should be dyed. Soft water is used. The dyed vinyl fabric is bright red, the dyeing rate is poor, the dye dosage is more than 1%, and the color depth is hardly increased. When cotton, viscose fiber and other fibers are dyed in the same bath, silk, wool and nylon are better than cotton. The viscose fiber is light and yellow, the second vinegar fiber is stained, and the polyester and acrylic fibers are slightly stained.

3. It is generally not used for cotton printing. It has been used for the printing of silk fabrics, plus urea and disodium hydrogen phosphate.

Color paste.

4. It has been mainly used for dyeing viscose fabrics. It has also been used to dye viscose fibers with blends of silk and nylon.

Precautions

Direct Violet 12 can be decomposed out of benzidine, which is a banned dye. The alternative dye is C.I.Direct Violet 47.