Bright-black flake or grain. Insoluble in water and alcohol. Soluble in sodium sulfide solution as green-black colour.
Similar to standard
Insoluble matters in the solution of sodium sulfide, %
Mainly used dyeing on cotton, viscose, vinylon and paper.
Must be stored in dry and ventilated. Prevent from direct sunlight, moisture and hot.
Fiber bags inner-lined with plasti...