Direct Brown 1

Copper ions in dyeing and dark colored light yellow, meet iron ion to yellow. 

Direct Brown 1 alias direct gold camel D3G, direct gold camel, direct yellow brown D3GE. Appearance is generally brown uniform powder. Water soluble, slightly sensitive to hard water. Dissolved in water orange brown, soluble in alcohol, slightly soluble in acetone And cellosolve, insoluble in other organic solvents. Dark red purple to purple black in concentrated sulfuric acid, brown after dilution; partially dissolved in concentrated nitric acid, reddish brown to orange brown. Yellow-brown. In case of copper ions, the color is yellow and dark, and the iron ions turn yellow.

Mainly used for cotton, such as glue of cellulose fiber dyeing, also can be used for silk, polyamide fiber, Sticky/brocade fabric dyeing, can also be used for the pulp and leather color.

Use condition:

1. It used to dye cotton or viscose fiber to get yellowish brown. Poor transferability, slow temperature rise during dyeing and salt addition to control dyeing, can obtain uniform color. Good dyeing rate, highest dyeing The temperature is 100 °C.

2. It has also been used to dye silk and nylon. When cotton, viscose fiber and other fibers are dyed in the same bath, the silk can be similar to cotton and viscose fiber. The wool is slightly dark and the nylon can be dyed. The vinegar fiber is stained, and the polyester and acrylic fibers are light gray.

3. It is generally not used for direct printing. When used for ground color discharge, the dyeing performance is still good. After dyeing the silk fabric, it is whitened with stannous chloride reducing agent, and the whitening effect is good.

4. It was once one of the main brown direct dyes. It is widely used in the dyeing of viscose fabrics and yarns. It is also used in cotton knitwear and carpet, flannel, viscose and silk or nylon. Dyeing of blended fabrics

Precautions

Direct Brown 1 can be decomposed out of benzidine, which is a banned dye. The substitute dye is direct yellow brown N-D3G