Chuantuo, also known as rubbing and rubbing, refers to a technique that uses rice paper and ink to rub the words and patterns on inscriptions and utensils. It can be called "China's oldest "Printing" is also an important technology for cultural relic protection and ancient book restoration.

In the training hall, the reporter saw all kinds of unexpected rubbings: fish, stone jars, rice dumplings, Pu'er tea cakes, salt, and even sneakers. Not only is the appearance complete and three-dimensional, but the texture and sense of age are also perfectly reproduced.