Color Fastness to Light Test Methods The color fastness of textiles refers to the fading degree and staining degree of textile color in the process of processing and use. The photo-fading principle of textile dyes is very complex: the structure of the dye is destroyed mainly because the dye absorbs photons, is stimulated, and a series of photochemical reactions occur, which … [Read more...] about Color Fastness to Light Test Methods and 3 Ways to Improve