Methods of removing handwriting: Step 1: Apply a little alcohol to the words to remove oil; Step 2: smear a small amount of potassium permanganate solution on the words; Step 3: Apply some acetic acid solution to reduce the yellow color caused by potassium permanganate. Disinfection method: exposure to sunlight (simple) The best disinfection method for old books is exposure to strong sunlight. After the water in the pages evaporates, turn them over and pat off dust, eggs, etc. However, precious books are not suitable and will damage the paper. It is best to disinfect with an ultraviolet disinfection cabinet. Microwave disinfection method (simple) A while ago, the Handbook of Prevention and Control of SARS in 302 Hospital was circulated on the Internet. It says something about the handling of books: wrap the schoolbag in a plastic bag, wrap it in a clean wet towel, and then heat it in a microwave oven with a "medium-high" level (650W power) for about 5 minutes. Freeze disinfection method (simple) put books in plastic bags and freeze them in the freezer for a few days. Not only sterilization, but also make old books smooth as new. Ozone disinfection method (difficult) adopts household ozone disinfection cabinet for disinfection. Put the books in the disinfection cabinet and turn on the power 1 hour or more. Ultraviolet disinfection method (difficult) If there are special conditions, it is a relatively simple and effective method to kill germs by irradiating books with ultraviolet tubes for more than half an hour. Jinan Library collects books returned by readers every week and puts them into ultraviolet disinfection boxes for disinfection. At the same time, he also reminded booksellers that it is best to disinfect the bought books with ultraviolet light and wash their hands after reading them to avoid getting sick. Chemical disinfectant fumigation disinfection method (difficult) For the disinfection of a large number of books, this method can be used. If ethylene oxide is selected as a disinfectant, books and documents can be put into nylon bags, polyethylene plastic bags (be careful not to break) or closed containers, and carried out according to the method of "A 14 Clothing Disinfection". The dosage is more than 2 grams per liter of volume, but not too much. Leave at room temperature (about 20℃) for about 20 hours. Because epoxy dioxane has the characteristics of broad bactericidal spectrum and strong permeability, it is very suitable to choose this disinfectant, but attention should be paid to safety when using it. Pay attention to fire and explosion prevention.

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