The bottom is also called the back cover. To put it bluntly, it is a process of thickening the drawn page. Backing is also a simple mounting, generally supported by raw rice paper.
Methods of supporting the bottom:
Underpinning means holding the painting core and sticking a layer of paper on the back of the work. His main function is protection. Leveling is to flatten the work, and the manual method is to stretch it directly on the wall after supporting the bottom. Mechanical installation is dried by mechanical heating.
Underpinning and leveling are two steps, but they are two different things, but they are usually completed at one time, that is, directly stretching or drying after underpinning. However, some mounters sometimes hang them on poles instead of on the wall, which is even uglier than the original.
Works without a backing can also be dry laid on the wall or mechanically flattened, but the paper is too thin to roll up and too thin to penetrate the background, but if it is written with thick paper, the effect is similar to that of the backing.