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Color fastness is a quality requirement for fabrics that have been dyed or printed. Colored fabrics can fade or change color over time due to factors such as light, sweat, friction, washing, and ironing, during wear and storage, which affects the aesthetic appearance of the fabric or clothing. The nature or degree of change in the staining state can be expressed by staining fastness. The dye fastness of fabrics is related to the type of fiber, yarn structure, fabric structure, printing and dyeing processes, type of dye, and the intensity of external influences. It can be divided into lightfastness, wash fastness or soap wash fastness, friction fastness, sweat fastness, ironing fastness, and sublimation fastness, among others. Next, Baijian Testing will provide you with a detailed explanation; we hope it will be helpful to you. 1. Lightfastness: Lightfastness refers to the degree to which the color of colored fabrics remains stable under exposure to sunlight. Its testing method can involve exposure to natural light or artificial light; after a certain period of exposure, the sample that has been exposed is compared with standard color samples. The degree of fading is classified into 8 levels, with level 8 being the best and level 1 being the worst. 2. Ironing color fastness: Ironing color fastness refers to the resistance of the color of dyed fabrics to fading when ironed. This discoloration and fading test is evaluated by checking for staining on other fabrics caused by the iron. The wash fastness of iron resistance is divided into 5 grades, with grade 5 being the best and grade 1 the worst; grade 5 is the best. When testing the ironing color fastness of different fabrics, it is necessary to select an appropriate temperature for the testing iron. 3. Soap wash fastness: Soap wash fastness refers to the degree of color retention in dyed fabrics after washing. A fabric sample is placed next to a standard bleached sample of the same size, and after being immersed in soap solution for a certain period of time, the degree of change in the fabric’s color characteristics as well as the degree of color transfer to the white fabric in the same bath are measured. Generally, gray grading sample cards are used as the evaluation standard, that is, the faded sample is compared with the original sample. The wash fastness is rated on 5 levels, with level 5 being the best and level 1 the worst. 4. Color fastness to friction: Color fastness to friction refers to the resistance of the color of dyed fabrics to fading after being rubbed, and it is divided into dry friction and wet friction. After repeatedly rubbing the colored fabric against the standard bleached fabric on the friction head of the wrapping cylinder, either in dry or wet conditions and under a certain pressure for a specified number of times, the degree of color transfer to the white fabric is measured, thereby determining the friction fastness values in both dry and wet conditions. The wash fastness to friction is evaluated using the folding staining test, and it is divided into 5 grades; the higher the grade, the better the wash fastness to friction. 5. Resistance to sublimation color fastness: Resistance to sublimation color fastness refers to the degree to which dyed fabrics are affected by sublimation during storage. The resistance to sublimation color fastness is evaluated using gray grading sample cards, by testing the processes of discoloration, fading, and whitening contamination after the material has been treated with dry heat pressing. It is classified into 5 grades, with grade 1 being the worst and grade 5 the best. The sublimation color fastness of fabrics generally needs to reach level 3-4 to meet clothing requirements. 6. Color fastness to sweat: Color fastness to sweat refers to the degree of color stability of dyed fabrics when exposed to sweat. Since the components of artificially prepared juices vary, they are generally tested not only individually but also in combination with other color fastness tests. The dyed fabric was bonded to a standard bleached fabric of the same size; after being immersed in a simulated juice for a certain period of time, the changes in the color characteristics of the fabric as well as the degree of staining on the white fabric in the same bath were measured. Stain resistance color fastness is rated on 5 levels; the higher the level, the better the stain resistance. 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