Xuan paper: It originated in the Tang Dynasty and has a history of 1500 years. Because Xuan paper has the characteristics of easy storage, durability and colorfastness, it has the reputation of "paper lives for thousands of years". The production process of Xuan paper lasted more than a year, and it required more than 100 processes, which seemed simple but actually very hard!

The magic of rice paper is closely related to a noun-"time". It looks "as light as a cicada's wings and as white as snow, shaking like a thread without hearing the sound", but its life span is almost the highest in all papers. Its indestructible quality has been as good as new for thousands of years, which is amazing-some murals in Europe centuries ago have begun to crack, become discolored or even worn out, and the Library of Congress in the United States has already experienced a crisis of "book self-destruction", while many precious materials and original paintings and calligraphy in China, such as Sikuquanshu, are safe and sound because of the use of Xuan paper. The Zhang Jizhi Classic of Southern Song Dynasty, which is collected by Anhui Provincial Museum, has a history of about 800 years, and the microscopic paper is still smooth and white.

Many historical relics, such as paper documents and physical objects preserved in major museums, show that the raw material of early rice paper was pure sandalwood bark. Later, after Xuan paper artists discovered that rice straw can also be made into pulp, rice straw became one of the important raw materials of Xuan paper. In rice paper, the skin is the backbone and the grass is the muscle. More skin makes paper tough, which is called clean skin; More grass softens the paper, which is called cotton material. Generally speaking, special leather is used for painting and cotton for calligraphy.

By artificially accelerating aging in the laboratory, the researchers made a "time showdown" for all kinds of papers: with the passage of virtual years, the whiteness of acidic machine-made papers such as newsprint and coated paper decreased significantly, while weakly alkaline rice paper stood still; Folding resistance is more peculiar. Compared with the rapid "landslide" of other papers, Xuan paper has a peculiar "hump shape", that is, for a long time, years have added "youth" to it; Many papers have been "broken bones" by 300 years, but the phloem fiber of Pteroceltis tatarinowii has hardly changed under the microscope after the rice paper was adhered to 1050, and it is still "vigorous in old age".