Sulfur dyes are a form of vat dyes and a new type of environmentally friendly dye – they are water-insoluble and in order to apply to fibers must be made water-soluble through the process of reduction. Moreover, Reduction is a chemical process in which hydrogen is liberated. The hydrogen reacts with the dye and attaches a water molecule to the dye. The dye is transported into cotton fiber by the water. This reduced dye must then be oxidized. Oxygen reacts with the hydrogen-producing water. Removing the hydrogen makes the dye insoluble, which results in the dye becoming physically trapped inside the fiber.
Sulfur dyes are a popular choice for coloring a wide range of fabrics, including cellulosic fibers and blends of cellulosic with polyester, nylon, and acrylics. These dyes are commonly used to produce deep, vibrant shades of black, blue, brown, khaki, and green.
Source from Denimsandjeans, Sunrisedyes
TW
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