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Color fastness is a key core index for colored paper, dyed packaging paper and art decorative paper. Poor color fastness means that paper color is easy to fade, bleed and stain under the action of water, friction, light and temperature change. In daily use and stacked storage, colored paper with unqualified color fastness will produce color bleeding pollution, stain attached paper sheets and packaging accessories, and cause color unevenness and pattern distortion of printed products. For high-end colored gift packaging and art decorative paper, color fading and bleeding directly reduce product grade and cause customer return complaints. Traditional dye fixing methods only physically wrap pigment molecules, with poor binding stability. Under humid environment and friction conditions, pigments are easy to fall off and bleed, and long-term light irradiation will cause irreversible color fading. Shandong Ludao Energy Technology Co., Ltd. launches professional paper color fastness upgrading solutions. By chemically locking pigment molecules and building stable color fixing structure inside fiber gaps, we prevent pigment shedding, bleeding and photodegradation. The solution improves water resistance, friction resistance and light resistance of paper color, maintains long-term bright and uniform color, avoids color cross-contamination, and improves the quality grade and market competitiveness of colored functional paper.