Color fastness refers to the ability of a dye or pigment to retain its original color under the influence of various external factors during its use or during the dyeing process. It is also the quality requirement for dyeing and printing fabrics. Because dyed fabrics can be worn or stored, they can be discolored or discolored due to light, sweat, friction, washing, ironing, etc., thereby affecting the aesthetic appearance of fabrics or garments. The nature or extent of the variation in the staining state can be expressed as the color fastness. The color fastness of fabrics is related to the type of fiber, yarn structure, fabric organization, printing and dyeing methods, dye type and external force. It can be divided into light fastness, washing or soaping fastness, rubbing fastness, perspiration fastness, ironing fastness and sublimation fastness. 1 day light fastness The light fastness refers to the degree of discoloration of a colored fabric by sunlight. The test method can be used either in the sun or in the sun. The fading of the sample after the sun exposure is compared with the standard color sample. The rating standards include wool blue and gray cards, national standard and European standard. For grade 8, grade 8 is the best, grade 1 is the worst; American standard is graded 5, grade 5 best, grade 1 worst. Fabrics with poor light fastness should not be exposed to sunlight for a long time and should be dried in a ventilated place. Xenon lamps are generally used for 24 hour testing. 2 washing fastness Washing or soaping fastness refers to the degree of color change after the dyed fabric is washed with the washing solution. Gray graded sample cards are usually used as the evaluation criteria, that is, the color difference between the original sample and the sample after fading is used for evaluation. Washing fastness is divided into 5 levels, 5 is the best and 1 is the worst. The fabrics with poor washing fastness should be dry-cleaned. If the wet-cleaning is performed, the washing conditions must be doubled. For example, the washing temperature should not be too high and the time should not be too long. Washing fastness is divided into two indicators, the original change and white cloth stained, white cloth stain is divided into cotton, nylon, polyester, wool, acrylic, acetate ester six fibers. The test temperature is 40/50/60/95 degrees, general silk and wool use 40 degrees, cellulose fiber uses 60 degrees. 　　 3 Friction fastness Rubbing fastness refers to the degree of discoloration of dyed fabrics after they have been rubbed, which can be classified into dry rubbing and wet rubbing. The rubbing fastness is evaluated based on the degree of white cloth staining, and is divided into 5 levels (1-5). The larger the value, the better the rubbing fastness. 4 perspiration fastness Perspiration fastness refers to the degree of discoloration of a dyed fabric after it is impregnated with sweat. Perspiration fastness Due to the different composition of artificially formulated perspiration, it is generally combined with other color fastnesses in addition to individual measurements. Perspiration is divided into 1 to 5 levels, the higher the better. In the European standard and the national standard, the perspiration fastness is divided into acid fastness and alkali fastness. 5Ironing fastness Ironing fastness refers to the degree of discoloration or discoloration of dyed fabrics when they are ironed. This degree of discoloration and fading is assessed by the color of the iron at the same time on other fabrics. Ironing fastness is divided into 1 to 5 grades, 5 is the best, and 1 is the worst. When testing the ironing fastness of different fabrics, the test ironing temperature should be selected. 6 fastness Sublimation fastness refers to the degree of sublimation that occurs in dyed fabrics during storage. Sublimation Fastness The grey graded sample card was used to assess the degree of discoloration, fading, and white cloth staining of fabrics after dry hot pressing and was divided into 5 grades, with grade 1 being the worst and grade 5 being the best. This test is generally used to disperse dye-dyed polyester fabrics. 7 chlorine fastness The chlorine soaking fastness is generally aligned with some swimwear because chlorine is contained inside the seawater and it is easy to fade the fabric. Nowadays, tap water in cities also contains available chlorine, and some hospitals and hotel supplies need to be disinfected with chlorine-containing detergents. Therefore, higher and higher requirements are placed on the fastness to chlorine bleaching. 8 light fastness Some fabrics have been tested for good perspiration fastness and light fastness, but during actual use, especially in summer, sweat dipping and sun exposure can easily fade, which puts forward a new requirement, at the same time New standards have also emerged. 9 peroxide fastness Most detergents today add peroxides such as peracetic acid and some activators, which cause the textiles to be oxidized and fade during the washing process. Therefore, the color fastness of textiles must have a certain tolerance to peroxides. The color fastness of normal fabrics is generally required to reach 3 to 4 levels to meet the wearing needs. Others include weather fastness, color fastness to cry, fastness to saliva, blisters fastness, dry fastness, etc. These fastnesses place higher and higher requirements on the textile printing and dyeing processing. Document finishing from DaYao Textile 8Color Blanket,Jacquard Colorful Fabric,South Afric Blanket,8Colorway Recycled Blanket Wenzhou Gangxin textiles co.,Ltd , https://www.gxblanket.com
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