AATCC original imported standard gray card, also known as "gray sample card for color change assessment" and AATCC standard color change gray card, is used to evaluate color change in color fastness test. This gray card is the most widely used in the American Standard 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 is evaluated according to the discoloration of the sample and the staining of the non dyed lining fabric. The color fastness test of textiles is a routine test item in the internal quality test of textiles. The degree of discoloration of dyed fabrics under the influence of external factors (extrusion, friction, washing, rain, exposure, etc.) is an important indicator of fabrics during use or processing. Because the conditions under which the fabric is processed and used are very different and the requirements are different, most of the current test methods are simulation tests or comprehensive tests according to the environment and conditions, so the content of the test methods for color fastness is quite extensive. However, according to many standards such as the international standards organization (ISO), the American Society of Dyers and Chemists (AATCC), Japan (JIS), and the United Kingdom (BS), the most commonly used items are washing resistance, light resistance, friction resistance, sweat resistance, ironing resistance, and weather resistance.
      
      Common color fastness tests include:
      color fastness to rubbing, light, washing, sea water, dry cleaning, heat resistance, migration of dyes during storage, color fastness to acid spots and alkali spots