How to remove stains from books

　　【1】When a book is stained with oil, place a piece of absorbent paper on the oil stain and gently iron it with an iron several times. The grease will be sucked into the paper and the pages will be smooth and clean.

　　[2] If the book is contaminated by ink, you can place a piece of absorbent paper under the pages dyed with ink, soak the stain with 20% hydrogen peroxide solution, and then place a piece of absorbent paper on the page with a heavy object on top. In this way, the ink will be dissolved and absorbed by the hydrogen peroxide, and the ink stain will disappear naturally after it dries.

　　【3】If there are traces of moisture on the book, you can use alum solution to clean it.

　　【4】If there are rust stains on the book, you can use oxalic acid or citric acid to wipe them off, then wash the pages with clean water, press the pages with blotting paper, and dry them in the sun.