Preparation
2-Amino-4-nitrophenol diazo, and 3-Methyl-1-phenyl-1H-pyrazol-5(4H)-one coupling, and then turn it into 1:2 chromium complex.
Properties and Applications
Orange powder, soluble in water. The strong sulfuric acid dyes for red, precipitation, diluted into old yellow, precipitation disappeared; In nitric acid to orange. The water solution is orange, add hydrochloric acid or sodium hydroxide are slightly after dark color. Discharge performance is good, encounter copper ions, chromium ion colour and lustre is no change, encounter iron ion slightly dark colored. Used for wool, silk and polyamide fiber dyeing and such as direct printing. Also used to dye the leather.
