How long can the handwriting on wool paper last?

Open doors, windows and bookcases on sunny days, so that the water absorbed by rice paper in the bookcase can be naturally distributed, which can be preserved for a longer time.

Brush is a traditional writing tool which originated in China. Known as jade tube and jade tube, it is listed as one of Four Treasures of the Study in China. The writing brush was invented by the Han nationality in production practice. With the continuous development of human society, the industrious and intelligent Han nationality constantly sums up experience, preserves the essence, abandons the dross and dares to explore and innovate. For thousands of years, it has made outstanding contributions to creating the splendid culture of the Han nationality and promoting the cultural exchanges between the Han nationality and all ethnic groups in the world. At first, the brush was made of rabbit hair, and later it was made of sheep, ferrets, wolves, chickens, rats and other animals. The pen tube is made of bamboo or other materials. The head is round and pointed, which is used for traditional writing and painting. Brush is a treasure provided by the Han nationality to the world art treasure house with a long history. A pen made of bird hair and animal hair. It is listed as one of Four Treasures of the Study in China. Hard hair, double brush, soft hair.