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White polka dots on red background. The process of white discharge printing typically entails reducing the dye chemically, resulting in white patterns formed by removing the dyed color. [12] [6] Fabrics made of denim or other indigo-dyed fabrics undergo a process of discharge using either potassium permanganate or sodium hypochlorite. [13] [14]
The fabric passes over rollers, immerses into a dye bath, and then proceeds through rollers that remove excess dye, allowing it to return to the dye container. [8] The difference between piece-dyeing in a vat and using a pad-dyeing machine is that in the latter, the fabric is continuously moved through one or more dye baths, rather than being ...
Vat dyes can be used to simultaneously dye the fabric and to remove underlying fiber-reactive dye (i.e., can dye a black cotton fabric yellow) because of the bleaching action of the reducing bath. The extra complexity and safety issues (particularly when using strong bases such as lye) restrict the use of vat dyes in tie-dye to experts.
Dyeing Pigments for sale at a market in Goa, India Cotton being dyed manually in contemporary India Silk dye in pan on stove. Khotan. Dyeing is the application of dyes or pigments on textile materials such as fibers, yarns, and fabrics with the goal of achieving color with desired color fastness.
Mordant colours like logwood black are applied in the usual way. The printing of wool is carried out exactly as for cotton, but if the best results are to be obtained, the engraving of the rollers must be deep, the blanket on the machine as solt as possible, and the drying of the printed cloth very gentle.
The jet dyeing machine use a low specific liquor ratio ranging from 1:5 to 1:15. The process involves making the fabric into a loop. This is done by sewing the ends together. The fabric is then moved slowly through the autoclave located inside the dye vat. The fabric is immersed in the dye solution which fills the vat.