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Vat dyes are a class of dyes that are classified as such because of the method by which they are applied. Vat dyeing is a process that refers to dyeing that takes place in a bucket or vat. The original vat dye is indigo, once obtained only from plants but now often produced synthetically. [1]
Dye is used to color fabric. There are two main types, natural dyes and synthetic dyes. The process is called dyeing. dye lot The dye lot is a number that identifies yarns dyed in the same vat at the same time. Subtle differences can appear between different batches of the same color yarn from the same manufacturer.
The jigger dyeing machine is a large closed dye vat with two main rollers located in the top half of the machine. The fabric is wound onto one roller and then fed onto the other. The dye liquor is located at the bottom of the dye vat below the two main rollers, it is specially designed to require a low liquor ratio.
aal Aal or Indian mulberry (Morinda tinctoria) is the source of the morindone dye sold under the trade name "Suranji". It is extensively cultivated in India for the dyeing of cotton, silk and wool in shades of red, chocolate or purple, dependent on the mordant used.
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.
Vat dyes are essentially insoluble in water and incapable of dyeing fibres directly. However, reduction in alkaline liquor produces the water-soluble alkali metal salt of the dye. This form is often colorless, in which case it is referred to as a Leuco dye , and has an affinity for the textile fibre.
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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.