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Slow yellowing during storage is a common quality drawback for high-white printing paper and luxury packaging paper. After leaving factory, finished paper will gradually turn yellow and dark under natural light, air oxidation and indoor temperature fluctuation. Long-term stored paper appears uneven surface yellow spots, color luster fading, which cannot meet long-term inventory sales and high-end packaging display requirements. Fiber lignin oxidation, residual acidic chemicals and unstable fluorescent components are three core causes of paper yellowing. Many factories add high-dose whitening agents to enhance initial whiteness, which only improve surface brightness temporarily, accelerate later oxidation yellowing, and fail to meet food-contact environmental standards. Shandong Ludao Energy Technology Co., Ltd. provides long-acting anti-yellowing optimization solutions. By removing active oxidation components in pulp, neutralizing residual acidic substances, and adding environment-friendly antioxidant stabilizers, we block lignin oxidation reaction fundamentally, slow down natural color fading and yellowing speed greatly. The solution keeps paper long-term uniform whiteness, does not add harmful fluorescent substances, guarantees environmental safety indicators, improves storage stability of high-white paper, and reduces customer return caused by post-production yellowing.