《梦溪笔谈·故事一》
我曾考察比较改字的方法，用刀刮削擦拭则容易伤纸破损，用纸贴住误字则又容易脱落；用铅粉涂抹则不容易盖住误字，要涂好几遍才能使误字漫灭。
尝校改字之法：刮洗则伤纸，纸贴之又易脱，粉涂则字不没，涂数遍方能漫灭。
I have studied and compared the methods for modifying words. It is easy to damage the paper by scraping it with a knife, and it is easy to fall off if the misspelled words are covered with paper. If lead powder is painted, it is not easy to cover the misspelled characters and it takes several times to make the misspelled characters disappear.