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What is "Sulphur dye" - Definition & Explanation

Dyestuffs usually applied to cotton from sodium sulphide solution. Associated with a limited colour range (drab and dark shades).
Sulfur dyes are the biggest volume dyes manufactured for cotton. They are cheap, generally have good wash-fastness and are easy to apply. The dyes are absorbed by cotton from a bath containing sulfide and are insolubilised within the fibre by oxidation. During this process the dyes form complex larger molecules which is the basis of their good wash-fastness.

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