nature : dark red powder. Purple was soluble in water solution. Case weak acid unchanged. Case of concentrated sulfuric acid blue. Its aqueous sodium hydroxide solution enhanced yellow. Right cellulose fiber dyeing, dye is absorbed into the good, the temperature at 80 ° C ~ 100 largest affinity. Right amino Acetanilide diazotization, and the double-J acid, alkaline Scarlet acid mixed solution coupling, the salting-out, filtration, drying derived. Used mainly cotton, linen, silk viscose fibers, nylon, rayon / Kam fabric dyeing, in particular for dyeing cotton knitwear. Can also be used with paper.