Direct Black EX
Green and black. Blue gray powder. 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.
Application: Mainly used for cotton, viscose, wool/stick,nylon/rayon blended fabric dyeing and printing, also used in leather and paper dyeing.
C.I. Name: Direct Black 22
C.I. Number: 35435
CAS Number: 6473-13-8
Molecular Weight: 1083.97
Molecular Formula: C44 H32 N13 Na3 O11 S3
Chemical Structure:
Packing: 25KGs pp Drum
