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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.
A dye is a colored substance that chemically bonds to the substrate to which it is being applied. This distinguishes dyes from pigments which do not chemically bind to the material they color. Dye is generally applied in an aqueous solution and may require a mordant to improve the fastness of the dye on the fiber. [2]
Dyeing in the Middle Ages. This glossary contains terms specific to dyeing.For terms used in the creation or manufacturing of textiles, including spinning, knitting, weaving, and individual fabrics and finishing processes, see Glossary of textile manufacturing.
In natural dyeing, there are "fast" dye compounds (those that have the necessary molecular structure to form stable chemical bonds with mordants and fibres, and so provide good resistance to fading when washed, exposed to light, or subjected to normal rubbing/abrasion; these are found throughout the historic record), and there are "fugitive ...
Hair coloring, or hair dyeing, is the practice of changing the color of the hair on humans' heads. The main reasons for this are cosmetic: to cover gray or white hair , to alter hair to create a specific look, to change a color to suit preference or to restore the original hair color after it has been discolored by hairdressing processes or sun ...
Colour fastness is a term—used in the dyeing of textile materials—that characterizes a material's colour's resistance to fading or running.Colour fastness is the property of dyes and it is directly proportional to the binding force between photochromic dye and the fibre.
“That’s nearly 17,000 people dying from prescription opiate overdoses every year. And more than 400,000 go to an emergency room for that reason.” Clinics that dispensed painkillers proliferated with only the loosest of safeguards, until a recent coordinated federal-state crackdown crushed many of the so-called “pill mills.”
Dyeing is commonly carried out with an anionic direct dye by completely immersing the fabric (or yarn) in an aqueous dyebath according to a prescribed procedure. For improved fastness to washing, rubbing, and light, other dyes such as vats and reactives are commonly used.