Direct Yellow R/ Direct Yellow 11/ Paper Dyes

Product Detail

Direct Yellow R

Direct yellow R is also called direct grass yellow and direct yellow 2G. The appearance is brown uniform powder, which is red and yellow when dissolved in water, slightly soluble in fibrinolysin and insoluble in other organic solvents. It is dark red in concentrated sulfuric acid and turns to dark yellow after dilution (sometimes producing brown precipitates); Partially dissolved in concentrated nitric acid turns yellow light brown to olive color, and partially dissolved in concentrated hydrochloric acid turns black. Direct Yellow R aqueous solution is olive yellow with concentrated hydrochloric acid and golden orange with concentrated sodium hydroxide. The color light is green when meeting copper ions, slightly dark yellow when meeting iron ions, and light yellow and orange when meeting zinc and ammonium ions

Direct Yellow R Application

1. Direct yellow R is used to dye cotton or viscose fiber fabrics with bright red light yellow. Its levelness and migration are poor. When dyeing, salt should be added to control the dye uptake in order to obtain uniform color. After dyeing, the dyeing bath should be naturally cooled to 60~80 ℃ to facilitate dye absorption. After dyeing, the fastness to wet treatment can be improved by fixing agent treatment.

2. Direct yellow R can also be used for dyeing silk and wool. When it is used for dyeing blended fabrics, the color of silk and wool is much lighter than that of cotton and viscose fiber, acrylic fiber is slightly stained, and nylon, diacetate fiber and polyester fiber are not stained.

3. Direct yellow R is generally not used for the printing of cotton and viscose fabrics, nor for the ground color discharge printing.

4. Direct yellow R is mainly used for dyeing viscose silk and silk interwoven fabric. Soap soda bath dyeing can make silk white.