First, brush alum water on the paper, dry it before using it, and don't turn black (this is probably the case with cooked publicity and production)
Second, spray alum water on the back of the work with a fine watering can, slightly moisten it, and repeat this for three to five times. Then put it on and it won't run away.
The third is to use the flying method, that is, brush the paste on the supporting paper, then use Su Xuan to brush the paste to absorb water, then remove the Su Xuan, and then brush the work on the supporting paper. Pay attention to this method to brush on the front of the screen. If the color is heavy, brush marks may appear. So use a wool brush, not a brown brush. If the decoloration is serious, it can be covered with a layer of plain brush (to ensure that there are no brush marks).
Fourthly, if the ink is only partially removed, the range can be outlined with alum water on the back of the ink edge, and then mounted.
Fifth, writing or drawing with ink should be normal. If the basic skills are still lacking and the ink can't be controlled, you can consider using ink with higher glue and less water.