There are white, yellow, amber, red and so on. The color of the screen has a great influence on the quality of the plate making. Colored screens, such as yellow, red, and amber screens, can prevent the diffusion of light when printing, while the white screen printing will show obvious diffusion. This is because the photosensitive material has a large absorption peak in the ultraviolet region. Since the white screen reflects white light when irradiated by the light source, it affects the photosensitive material. The irradiated light reaches the emulsion coating through the transparent part of the positive film. When the irradiated light contacts the white silk screen, reflection, inflection-reflection, and diffuse reflection phenomenon occur, which causes the floating phenomenon of the printing plate, that is, halation. If a colored screen is used, this phenomenon will be prevented because the colored screen can absorb a part of the irradiated light, thereby reducing the reflection intensity of the irradiated light, and the colored screen reflects the colored light, which is inactive light, so select The material does not affect, especially when printing fine prints, the color of the screen is particularly important
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