Search results
Results from the WOW.Com Content Network
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.
A dye-works with baskets of dyestuffs, skeins of dyed yarn, and heated vats for dyeing, in Odisha, India. Natural alum (aluminum sulfate) has been the most common metallic salt mordant for millennia (see Papyrus Graecus Holmiensis , mordant and dye recipes start at recipe #84), but tin ( stannous chloride ), copper ( cupric sulfate ), iron ...
In China, dyeing with plants, barks and insects has been traced back more than 5,000 years. [1] Natural insect dyes such as Tyrian purple and kermes and plant-based dyes such as woad, indigo and madder were important elements of the economies of Asia and Europe until the discovery of man-made synthetic dyes in the mid-19th century
A dye is a colored substance that chemically bonds to the material 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]
Package dyeing is a method where yarns are wound on perforated cones placed in a dye vessel. The dye solution is then alternatively pushed inside out and vice versa. Examples are many stripes, patterned (checks) and jacquard designed fabrics. [9] [15] Piece dyeing: In piece dyeing, the dyeing takes place after producing fabrics with undyed ...
Perhaps patients who can’t swallow need a liquid version of a tablet medication, or someone with an allergy needs a dye removed. Compounded versions of a drug also help fill a gap when a ...
Elon Musk became rich and famous as an entrepreneur, but he’s quickly making a new name for himself as one of the most singular and polarizing figures of any presidential administration.
Cotton is an absorbent fibre which responds readily to colouration processes. 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 ...