The soluble dye is sucked by the material and it needs oxidization to make the dye permanent on the surface of the material.
Sulphur Black Dye:
In 1893 the chemist Vidol make a reaction of sodium sulphide and Sulphur
with organic base (paraphenyl-enediamine or paramino phenol) and produce vidol
black. This is known as Sulphur dye stuff. To develop the black color, Vidol
black is oxidized by potassium di chromate on the cloth surface during dyeing.
Properties:
- It is cheap in price.
- Wet fastness is good but light fastness is not so good.
- It is insoluble in water. But reacting with Na2S (reducing agent) it produce
Thiol which is water soluble.
D-S-S-D + Na2S D-SH + D-SH
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