Analysis of safety standards for home textiles - color fastness

Color fastness refers to the degree of textile color fading and staining. Printed and dyed textiles are usually subject to special printing, dyeing and functional finishing processes, such as resin finishing, flame-retardant finishing, sandwashing, brushing, etc., according to their usage or corresponding quality requirements. According to its use process and environment, textiles will be subjected to light, washing, ironing, sweat, friction and chemicals and other external effects, which will test whether the dyes of textiles and fabrics are complete and firmly combined.

In people's daily life, textiles due to external or own reasons caused by the original color change phenomenon, called color change. When textiles enter the washing procedure, the dyestuffs between different fabrics will be stained with each other, thus causing changes in the color of other textiles, which is called color staining. Textile color fastness rating in addition to light and weather color fastness using the eight-level system, the general use of the five-level system, that is, 5, 4, 3, 2, 1, the greater the number of levels of color fastness is higher.

The color fastness of textiles usually includes: color fastness to washing, friction, perspiration, water, light, saliva and dry cleaning.

Color fastness to washing: the ability of textiles to maintain the original color (hue, color depth) after washing in the specified washing conditions. The general theory is that dyes containing water-soluble groups have poorer color fastness to soaping than dyes that do not contain water-soluble groups, and water-soluble dyes are more likely to combine with water and thus fall off from textiles. The higher the degree of binding between the dye and the fiber, the higher the color fastness to washing.