Color fastness ratings can be divided into visual rating and instrument rating. When rating with eyes, it is required that the background should be neutral gray, approximately between the 1st and 2nd levels of the original gray sample card (approximately N5 of the Munsell color card). The lighting conditions should be clear northern daylight (9:00-15:00), or an equivalent light source with an illuminance of 600lx or above. The incident light forms an angle of approximately 45 º with the surface of the textile, and the observation direction is roughly perpendicular to the surface of the textile. The color of the cover plate for the original sample and the test sample should be consistent, preferably in neutral or gray or black, with roughly the same size and shape. Rating personnel should wear neutral gray work clothes, and the rating process should avoid the influence of environmental colors.

Color fastness rating: Compare the tested sample with the original sample to see which level of color change is closest to the gray card.

Staining fastness rating: Compare the tested lining with the untested lining to obtain the closest staining level.