Why does a metal border requires an additional frame when offset printing?
The CMYK printing is based on 4 colors of reference: Cyan, Magenta, Yellow, and Black. But the high definition of this process relies on the fact that these 4 colors are printed on a white background. In the case where the printing fits exactly to the outside cutting, the white color covers the whole surface. But if a metal boarder must appear, we will need an additional frame to define the surface to print in white, which will be smaller than the outside cutting.
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