The color application of Yuxian window grilles has an obvious subjective emotional tendency. It is characterized by abandoning the cumbersome and using simple and simplified techniques to express emotions and moods.
The window grilles in Yuxian are mainly incised, leaving enough space for dyeing colors, which makes it easier to handle the area relationship of the colors. It uses a plane technique to summarize the color of objects and process it concisely, which can better organize the colors of the picture. When dyeing, emphasize the contrast and echo of the area size of the same color to grasp the unity of tone; pay attention to the proportion and operation position of the contrasting color area to reflect the relationship between primary and secondary and before and after.
The characteristic of intaglio engraving is to engrave the outline of the original manuscript and retain the parts other than the outline. Therefore, the characteristic of incised paper-cut window grilles is that the lines are not necessarily connected to each other, and the whole work is mostly block-shaped. The incised technique of the Yuxian window grilles makes the proportions and contrast between the "picture" and the "ground" of the window grilles greatly different. After spot dyeing, because there are more "pictures" and less "ground", the color blocks are arranged closely and show a strong color charm.
The combination of Yuxian window decoration is based on scattered dots, using color brightness, purity and hue to express the size and front and rear position of the decorative image. There are two aspects to the dispersion of dyeing. First, the window grille carving technique produces changes in the basic positive and negative shapes ("picture" and "ground"). The negative shapes divide the colors of the positive shapes. For example, the Kaijia of the window flower figures in Yuxian County uses armor pieces to divide the overall color of the Kaijia; the decorative flowers on clothes or animal bodies, the veins of plants, and the stamens of flowers also play a role in dividing colors. The second is the change in the layout of the dyeing. The composition is broken up and colors are applied in categories. The "three colors of azure" appear in different parts of the window grilles to achieve harmony and unity of the entire work.