Motifs show a mlange, mottled or streaked effect, imitated in machine printing. The operation may be repeated several times and several colors may be used for the bizarre effects. Portions of the fabric are coated with wax so that only un-waxed areas will take on the dye matter. This is one of the oldest forms known to man. Imitation chambray and comparable fabrics are often dyed this way. The material is sent without scouring or singeing, through a cold water bath where the sized warp has an affinity for the dye. This is a low-cost method to dye cotton cloth. Disperse dyes are polar molecules containing anthraquinone or azo groups. It is a category of synthetic dye intended for polyester and related hydrophobic fibers. These are usually used to dye cellulosic fibers such as cotton, rayon, or flax, but polyamide, wool, silk, and acetate fibers can also be dyed using reactive dyes. Reactive dye is a class of dye that makes a covalent bond with the fiber and becomes an integral part of the fiber. Vat dyeing is a process that refers to dying that takes place in a bucket or vat. These are a class of dyes that are classified as such because of the method by which they are applied. These dyes are not found in ready-made form. The dyes which contain insoluble azo group(-N=N-) are known as azoic dyes. Sulfur dyes are predominantly black, brown, and dark blue. They are inexpensive, generally have good wash-fastness, and are easy to apply. Sulfur dyes are the most commonly used dyes manufactured for cotton in terms of volume. bind) dyes on fabrics by forming a coordination complex with the dye, which then attaches to the fabric (or tissue). Some acid dyes are used as food colorants, and some can also be used to stain organelles in the medical field.Ī mordant or dye fixative is a substance used to set (i.e. They are mainly used to dye wool, not cotton fabrics. Basic dyes are also used in the coloration of paper.Īn acid dye is a dye that is typically applied to textile at low pH. Usually, acetic acid is added to the dye bath to help the uptake of the dye onto the fiber. Direct dyes are very easy to apply and available in the market.īasic dyes are water-soluble cationic dyes that are mainly applied to acrylic fibers but find some use for wool and silk. These are anionic dyes substantive to cellulosic fibers when applied from an aqueous bath containing electrolyte. All the dye staff is classified according to their applications. There are various types of dye staff present in the market. The substance which causes the change in color to a substrate is called dye.”The process of applying color to fiber stock, yarn, or fabric is called dyeing.” Dyeing in Textile Dyes Properties Dyeing is the application of dyes or pigments on textile materials such as fibers, yarns, and fabrics with the goal of achieving color with the desired colorfastness.
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