Appearance:Reduced direct black is mainly used for cotton fiber dyeing and cotton printing, as well as vinylon and viscose fiber dyeing
Synopsis: Black powder with metallic luster. Insoluble in water and xylene, soluble in pyridine (blue with brownish red fluorescence). Dark purple in concentrated sulfuric acid. It is red purple in alkaline solution and yellow brown in acid solution.
Structural formula:
Properties
Summary
Reduced direct black is mainly used for cotton fiber dyeing and cotton printing, as well as vinylon and viscose fiber dyeing
Black powder with metallic luster. Insoluble in water and xylene, soluble in pyridine (blue with brownish red fluorescence). Dark purple in concentrated sulfuric acid. It is red purple in alkaline solution and yellow brown in acid solution.
Manufacturing
