The purpose of shadow pen

1, used to spread a large area of background color in advertising paintings, especially when painting the poster of the first mate;

2. Some pictures should be pasted before painting. At this time, brush a layer of water evenly with a shading pen, and then seal the paper on the drawing board with wide tape. After drying, the paper is very hard and will not wrinkle.

3. When painting watercolors, brush the paper with clear water first, and then paint it after half-drying, which can reflect the misty and rainy effect.