Sulphur black can be classified as BR (Bluish-Reddish) and B(Bluish)by their different tones, and the tone and quality can be adjusted according to the customer's requirements.
Appearance: Flashing black flakes or granules
Product character: Sulphur black is insoluble in water or ethanol, it appears as green-black in the solution of sodium sulfide, appears bluish when put caustic soda in the solution of sulphur black, and appears greenish precipitate with hydrochloric acid.
It's miniature soluble in cold sulfuric acid, turns to greenish blue precipitate after it's warmer, then turns to black-blue when keeps heating. Sulphur dyes have good dye-uptake and level dyeing.
Sulphur Black used in dyeing textile Main features:
A. Strength 200%(full).
B. Standard greenish and reddish tone
C. Can be dissolved directly in water without adding any sodium sulfide.
D. Most environmental protective dye used in the dyeing of paper.
Properties: Slightly insoluble in water, soluble in Sodium Sulfide with a green-black color.