Direct Black Dyes
Name: Direct Black 22
Molecular Formula: C44H32N13Na3O11S3
Molecular Weight: 1083.97
CAS Number: 6473-13-8
Properties and Applications: Soluble in water for violet black. The strong sulfuric acid for violet black, dilute black light after brown precipitation; In nitric acid solution for the red light brown in, precipitation. The dye solution to join strong hydrochloric acid have brown light black precipitation; Add thick sodium hydroxide solution for dark blue light red. Mainly used for cotton, viscose, wool/stick,nylon/rayon blended fabric dyeing and printing, also used in leather and paper dyeing.