2g yellow is a pigment or a dye?
Uses: mainly used for wool wool and hair dyeing, can be used for silk dyeing, and sometimes used for dyeing nylon (only should adopt after the media law). Wool and a variety of fiber bath with the bath, the nylon color than wool shallow, silk is more shallow, diacetate fiber, cotton, viscose is not stained. It can also be printed directly on chrome or silk fabrics treated with chrome topcoat, except for a small amount, used for painting and adjusting shades.
Nature: dark yellow powder. Soluble in water was yellow, slightly soluble in ethanol, chloroform and lysosomal, insoluble in other organic solvents. In concentrated sulfuric acid was red and yellow, diluted yellow solution and precipitation; in concentrated nitric acid was yellow solution. Its aqueous solution, concentrated hydrochloric acid or concentrated sodium hydroxide solution, are yellow. Dyeing, the case of copper ion color slightly darker, the case of iron color is darker. Good discharge.
