That one is called "copy paper". Sulfuric acid paper is like frosted glass, but it is hard; rice paper absorbs water, and ink will penetrate into the paper and stain it. The front of the post is copy paper, which costs about one yuan a piece. When opened to a large size, it is close to the size of sixteen sheets of A4 paper (perhaps I remember the proportions incorrectly). And I have a suggestion. When practicing calligraphy, it is nothing more than copying. LZ’s method is to copy. The so-called copying means to put the calligraphy in front of you and follow the writing. The effect of copying is much greater than that of copying, although neither can be done. few. If you need it, you can use rough-edged paper, which is generally available in Xinhua Bookstore or places that sell stationery supplies. It is not expensive. For beginners, just buy it for seven or eight yuan a piece (one hundred sheets, although it is usually not enough).