When printing a large area of ​​light-colored uniform color patches, it is usually used to add spot light agent in the original ink to prepare spot color ink, and then perform solid printing, so that the ink layer is thicker, and it is easier to obtain a uniform and thick color effect. If a four-color printing process is used, a low percentage of flat screen dots must be used. However, the low percentage of flat mesh dots is easy to cause small dots in some parts due to tiny sand or poor suction during printing, resulting in uneven ink color: it is easy to cause too much water supply during printing. Paper dust accumulates on the printing plate and blanket, and the smoothness of the paper is low, which causes poor ink transfer of small dots. As a result, the ink color becomes lighter and the ink color is uneven.
For dark and large-area color blocks, the four-color printing process may be used to superimpose several high-salt number dots of several colors. The ink layer is too thick and the back side is smeared; while using the spot color printing process, only one Color, it is not easy to appear dirty on the back. With the four-color printing process, some parts of the picture and text may be composed of several colors; while with the spot color printing process, the corresponding parts are printed with only one color, which avoids the possibility of overprinting errors.
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