1. Wipe: Wipe the font carefully with some wet cloth or eraser, choose a color closer to the background color, and supplement the inconsistent part of the background color to make the background color uniform gradually.
2. Complementary colors: use pigments that are not much different from the background color, apply them repeatedly, and gradually unify the colors. This process may require a lot of experiments and repairs.
3. Treatment method: If the background colors are quite different, the visual effect can be controlled by local brush strokes to maintain the overall sharpness and beauty. This method requires certain calligraphy skills and constant practice.