2, anti-folding. Cooked paper, chalk paper and wax paper have changed their properties because of processing, and are fragile and easy to break, especially chalk paper and wax paper. Once they wrinkle, there will be irreparable white cracks. Therefore, for the preservation and carrying of these papers, they can only be rolled up or laid flat, and they must not be wrinkled.
3. Sun protection. There are ultraviolet rays and infrared rays in the sun. Paper will become brittle and yellow after long-term irradiation, and its quality and life will change. Therefore, the sun protection of paper is as important as moisture and mildew prevention.
4. Prevent moths. There is an insect, also called stingray, which likes to eat paste or colloid in paper. After a long time, books will be eaten. One way to deal with catfish is to dye paper with phellodendron bark liquid. Cortex Phellodendri is a traditional Chinese medicine, which has the functions of clearing away heat and dampness, purging fire and detoxifying, and also has the function of killing insects. Famous calligraphers in the Eastern Jin Dynasty, such as Wang Xizhi and Wang Xianzhi, often used yellow paper to write. Dunhuang stone room has preserved the roll paper of 1000 years, which has not been damaged or eaten by insects for a long time. It's all yellow paper dyed with phellodendron liquid. The second is pickled pepper water, which is used after drying. Pepper water can kill insects and prevent paper from being eaten by insects.
Pepper is Zanthoxylum bungeanum (Sichuan Zanthoxylum bungeanum), which has the characteristics of spicy taste and can be used as medicine to relieve pain and kill insects. The third is to put strong-smelling substances to drive away moths, such as some musk, papaya, weeds and so on. This "Wan Nianhong" paper is orange. The orange pigment on paper contains lead oxide, the main component of which is lead tetroxide, which is toxic. A small amount of it can poison octopus. So brush the orange paint on the paper and dry it in the shade to become a non-smoking paper. In addition, in general, paper and books wrapped in newspapers can also be moth-proof, because ink also has a certain moth-proof effect.