So how should our family protect and collect books and periodicals? Humidity is very harmful to books, because non-cellulose components in paper or harmful substances such as acid, alkali and bleaching powder remaining in paper will cause paper aging and corrosion to paper fibers under the influence of high temperature and high humidity. In addition, humidity can also cause books to be moldy and moth-eaten. Therefore, family bookshelves and bookcases should be placed in dry and ventilated places. All kinds of light are harmful to books, especially sunlight. So the bookshelf should avoid direct sunlight. For books that have been damp, they should be ventilated and dry, and must not be exposed to the sun to prevent the writing materials from yellowing and becoming brittle. Books should be protected from insects. You can put some paper-wrapped sanitary balls, natural camphor blocks, camphor powder and other insect-resistant drugs that are harmless to people in bookshelves and bookcases; And often turn over books and find books and periodicals that are eaten by insects and bitten by rats, and deal with them in time to prevent their spread. When the book is put, the hardcover book and paperback book are really put, and the spine is outward, so it is easy to find. When placing, if the first floor is not full, you can put a book file to avoid the book being loose and askew, causing the back of the book to bend and the pages to curl. Thread-bound books are relatively light and should not be placed directly. For thread-bound books with letter sleeves, it is better to lay them flat. Open a large book (such as periodicals and magazines) and don't stuff it into the low shelf. Keep the bookshelf and bookshelf clean. Dust not only pollutes books, but also easily causes moth-eaten and mildew. Damaged books should be repaired in time, especially the folds in the corners, and leveled at any time. In order to remember to see a page of a book, use bookmarks and don't fold corners. Books and periodicals stained with fingerprints can be scrubbed once or twice with cotton dipped in soapy water, and then dried with absorbent paper. If you are stained with ink, you can use absorbent paper to pad under the pages stained with ink, gently scrub them with cotton balls soaked in hydrogen peroxide, then cover them with a piece of absorbent paper and press some thicker books on the paper. When the pages are dried in the shade, the ink will disappear. Books and periodicals can be scrubbed with cotton balls soaked in alum water, and then dried with absorbent paper. Generally books and papers turn yellow because of oxidation. If we can avoid oxidation as much as possible, we can also avoid yellowing of the paper. As long as you can guarantee the following three points, paper yellowing can basically be avoided. These three points are to reduce contact with air, water and sunlight. For most people, contact with air is inevitable, but contact with moisture and sunlight can be avoided as much as possible. If you don't use some books often, you can try to seal them in a plastic bag and take them out when you use them. Usually, the shelf life of paper should not exceed one year. Even if the storage conditions of paper are good, the paper will change color and deteriorate if it is stored for too long. If the paper is stored for two years, the coated paper will turn yellow and lose powder; Newsprint turns yellow and brittle; The wrapping paper is discolored and its strength is reduced; Yellow paperboard and box paperboard will go moldy and deteriorate, and so on. In addition to the destruction of paper fibers caused by the aging and oxidation of the paper itself, the addition of chemicals in modern machines and the harsh environment (such as air pollution, ultraviolet rays, temperature and humidity, etc.) also make the paper tend to be acidic. ) and man-made damage will cause paper deterioration. In addition, paper turns yellow because it contains lignin, which is an acidic substance. It will be oxidized due to contact with air, light and humidity, then change color and eventually become brittle and damaged. The methods to prevent paper from yellowing are as follows: 1. Take it to people for gluing (there are several kinds of glue, also called polishing or oil painting) 2. Hot-pressed film protective shell; 3. Store in a professional safe; 4. Mounting, all kinds of materials are effective; 5. Press under the table glass or plastic mat. In addition, you can try the following methods: 1. Blow hot air with shrink film, or compress the quilt. 2. Roll it up and down with unused paper, or collect the poster bucket. Try not to be light and airy anyway. Keep the dry paper yellow because it contains lignin. Lignin is an acidic substance, which will make paper oxidized and discolored due to exposure to air, light and humidity. The best way is 600. The second method can only prolong the life of paper.