Packing products or book covers are often made up of average color blocks of different colors or regular abrupt color exhibitions and text. These color blocks and text can be separated by four-color primary ink collision. It is also possible to distribute spot ink printing and then print only one kind of spot ink at the same color block. Under the condition of synthetically considering the improvement of printing quality and economizing the number of overprints, spot ink is sometimes chosen for printing.
What's the difference between spot color and four-color ink?
The color of ink allocated by spot-color printing is obtained according to the principle of subtractive mixing of colors. The brightness of the color is low and the saturation is high. The average solid background of ink is printed in spot color. With proper increase of ink content, the flexibility of color change caused by thicker change of ink layer will be reduced. So it is easier to get the average ink, thick printing effect.
A block of four-color printing. Because the various colors of the color block are mostly composed of a certain proportion of dots. When printing dots, the thickness of ink must be strictly controlled. It is easy to cause large chromatic aberration due to the change of ink thickness.
If you can't use a polychromatic machine to print out the color at one time, it is also easy because the color of semi-waste products is not easy to control the color deviation. It usually does not use four-color printing, but uses spot-color printing. This is also the monochrome and dichroic printing spot color in many printing plants. Four colours, eight colours printing four colours more. Five colours ordinary printing four colours plus a spot colour or oil, etc.
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