Although some dyes may be typically dyed a relatively bright color, and direct dyes, acid dyes, water-soluble anionic dye chromatography is complete, but because of the dye with a water-soluble group, such that good wet fastness, fading and staining phenomenon severe. Not only the appearance of old textile itself, but fell off the dye will stain the other color dyed fibers, resulting in staining, take the color phenomenon. In addition, although the dye and fiber, including covalent bond is rather strong, but in fact, the unreacted dye and the hydrolyzate was not completely washed from pollutants, this part of the dye will fade, and the total pollutants valence bond will hydrolyze off key. In order to improve the fabric color fastness, solid color processing can be performed.