Sunbathing can remove moisture and prevent insects. Don't read in bright light, and don't read in rainy and humid weather. First, it will make books moldy, and second, it will accelerate the oxidation process. It's best to wear gloves, because there are a lot of sweat stains and grease on people's hands, which will stick to books as they turn pages. The longer the time, the more accumulation, which will accelerate the oxidation process. Too many of these things will make books yellow. ) You'd better read less precious books, if possible. Put the desiccant into the box, and inject high-purity nitrogen into the box to prevent oxidation. Under the natural environment, paper will be harmed by oxygen and harmful gases in the air, and oxidation, acidification and hydrolysis will occur, which will make paper yellow and brittle. Nitrogen protection can prevent these reactions on books and papers.