AATCC original imported standard grey card, also known as "grey sample card for assessing staining". Used to evaluate staining in color fastness test. This gray card is the most widely used in American standards and is also frequently used in the standards of famous sports brands at home and abroad Color fastness refers to the resistance of the color of textiles to various effects in the process of processing and use. The fastness grade shall be evaluated according to the discoloration of the sample and the staining of the undyed lining fabric. The color fastness test of textiles is a routine test item in the internal quality test of textiles. The fading degree of dyed fabrics under the action of external factors (extrusion, friction, washing, rain, exposure, etc.) is an important index of fabrics. Because the conditions of fabrics in the process of processing and use are very different, and the requirements are different, most of the current test methods are simulated tests or comprehensive tests according to the action environment and conditions, so the content of test methods for color fastness is quite extensive. However, according to the international standards organization (ISO), American Association of Dyers and Chemists (AATCC), Japan (JIS), Britain (BS) and many other standards, the most commonly used items are washing resistance, light resistance, friction resistance, Perspiration resistance, ironing resistance, climate resistance, etc. ⏹ Common color fastness tests include: color fastness to rubbing, color fastness to light, color fastness to washing, color fastness to sea water, color fastness to dry cleaning, color fastness to heat, migration of dyes during storage, color fastness to acid spots and alkali spots