What is the preservative for calligraphy and painting pasting?

Paste can be packaged at will, but if it is bottled, it is best to attach a plastic or thin bamboo tube to each bottle for the convenience of users. If the paste can be made according to the scientific method, it will not be easy to dry, stink and mold. In order to make a fragrant paste, glycerol is added to the raw materials to keep them moist; Alum and liquid carbolic acid are added to sterilize and prevent decay. Its viscosity is good, durable, fragrant and widely used.