What if the painting is wet and there is a watermark?

Rinse with water. Put the work (after the work is finished, it must be left for a long time to let the ink and pigment dry thoroughly) (not too expensive) into clean water (the pure water on the market is the best now, but the dosage is too much). It is also possible to open it with cold white rice, which can remove some minerals. In the big plate, all the paper will be submerged. Ordinary water marks can be removed by washing several times.

If it is a stubborn water stain or stain, find a glass plate larger than the work and wipe it clean. Spread the paper flat, soak it with a clean white towel (preferably new), twist it half dry, roll it into a roll, then roll it on the paper like a roller, press it again, and wash the towel with clear water; In this way, you can wash the roll over and over again, and then rinse it with clear water after washing away the water stains.

The washed works should be picked out with a straight and smooth stick (such as a stainless steel tube with a diameter of two or three centimeters), dried, and then supported or mounted.