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Dyeing house and textile dyeing |
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| Release time:2013-05-07 Source:admin Reads: | |
| The colors were mixed according to the Pantone book; generally, the designer will confirm the color before printing the hangtags. The earliest surviving evidence of textile dyeing was found at the large Neolithic settlement at, were found. In China, dyeing with plants, barks, and insects has been traced back more than 5,000 years. The dye used in this case was madder, which, along with other dyes such as indigo, was introduced to other regions through trade. Natural insect dyes such as purple and kermes and plant-based dyes, 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. Alizarin, the red dye present in madder, was the first natural pigment to be duplicated synthetically a development which led to the collapse of the market for naturally grown madder. The term "direct dye application" stems from some dyestuff having to be either fermented as in the case of some natural dye or chemically reduced as in the case of hangtags and sulfur dyes before being applied. This renders the dye soluble so that it can be absorbed by the fiber since the insoluble dye has very little substantively to the fiber. Most other classes of synthetic dye, other than vat and surface dyes, are also applied in this way. The term may also be applied to dyeing without the use of mordant’s to fix the dye once it is applied. Mordant were often required to alter the hue and intensity of hangtags and improve color fastness. Chromium salts were until recently extensively used in dying wool with synthetic mordant dyes. These were used for economical high color fastness dark shades such as black and navy. Environmental concerns have now restricted their use, and they have been replaced with reactive and metal complex dyes that do not require mordant. |
