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Photochromic defect is a subtle but high-impact quality problem for high-grade color printing paper and art paper. Under long-term natural light and ultraviolet irradiation, ordinary paper will produce invisible photochromic reaction, resulting in uneven color shift, tone deviation and local chromatic aberration. Different from conventional yellowing and fading, photochromism refers to instantaneous or delayed color change under light irradiation, which leads to inconsistent color presentation of printed patterns in different light environments. This defect seriously affects the display effect of high-end art prints, luxury color packaging and museum collection paper products. Most traditional anti-fading technologies only resist oxidation aging and cannot inhibit photochromic molecular mutation caused by ultraviolet light. Single whitening and brightening agents will aggravate photochromic deviation and reduce paper color stability. Shandong Ludao Energy Technology Co., Ltd. provides professional photochromic stabilization solutions. By adding targeted UV absorption and photostabilizing components, we lock fiber molecular color groups, inhibit light-induced molecular mutation and color shift reaction. The solution maintains consistent paper base tone under long-term light irradiation, ensures accurate and stable color restoration of printed patterns, improves the artistic display effect of high-end printed products, and solves the after-sales color difference complaint problem caused by light change.