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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.
Azoic dyeing is a technique in which an insoluble Azo dye is produced directly onto or within the fiber. This is achieved by treating a fiber with both diazoic and coupling components . With suitable adjustment of dyebath conditions the two components react to produce the required insoluble azo dye.
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 ...
Top dyeing is dyeing worsted wool fibers after they have been combed to straighten and remove the short fibers. The wool fiber at this stage is known as top. Top dyeing is preferred for worsted wools as the dye does not have to be wasted on the short fibers that are removed during the combing process.
Reactive dyes have good fastness properties owing to the covalent bonding that occurs during dyeing. Reactive dyeing is the most important method for coloring cellulose fibers. Reactive dyes can also be applied on wool and nylon; in the latter case they are applied under weakly acidic conditions.
A woman with dyed pink hair. 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 bleaching.
How to use a hair toner at home. When toning your hair at home, Valdes recommends doing a patch test with a small piece of hair to see how it looks when it dries before moving to the rest.
The amount of this attraction is known as "substantivity": the higher the substantivity the greater the attraction of the dye for the fiber. [1] Substantive dyes work best on textiles with high contents of cellulose, such as cotton.