Our exclusive AATCC friction white cotton cloth is used with a friction fastness tester. After passing a certain number of back and forth rubs in the dry/wet conditions required by the standard, use AATCC to fade gray, pollute gray and AATCC six colors Grade 9 card (ISO gray scale is stipulated in some standards), which evaluates its fading and pollution level, so as to evaluate the color of the sample when it comes into contact with other materials and fibers.