The application and difference of monochrome black and four-color black in printing

In printing, black corrugated boxes, we often encounter some unexpected details. For example, when using CDR to design documents, it is clearly designed to be black, but why is the printed color not black enough? Next, the editor will explain the difference between monochrome black and four-color black, and how to set the CMYK value to print pure black during the printing process.

Optically speaking, the three colors of CMY are synthesized into white light, but due to the opacity of the printing ink, CMY is synthesized into black. In the early stage of the improvement of modern printing technology, this was also the basis for black coating, but after the development of offset printing, the ink layer was thinner, the underlying color penetrated, and the hue was felt impure, so the introduction of black group K, then if you want the printed product to show For the effect of pure black, we need to set CMYK to 100 at the beginning of the design.

As shown in the figure below: the left single black C:0 M:0 Y:0 K:100, the right four-color black C:100 M:100 Y:100 K:100, the effect presented by the two blacks is different , one is grey-black and one is pure black.

And most printing factories often set the color value to C:40 M:30 Y:20 K:100 when printing pure black, because this setting can effectively avoid the printing of printed products due to excessive ink volume. In the process, the back is stained with flowers, which can also make the ink dry quickly. Excessive amount of ink will result in slower drying, which will affect other subsequent processes.