In the printing process, the easiest thing we can touch is to print black. How can we print black? Pay attention to the following points.

1. The printed black color is not even black if it is k100. It is because of the printing machine rubber - equipment, which is a common problem. So if it is monochrome (special color) printing, you can print it twice, but if there is a shallow net in pure black, it will be 50%-70% on the original basis. For example, if the shallow net is k60, then if it is printed twice To adjust to k35 or so, it is best to have a standard proof for the printing master to adjust.
2, the black color of the four-color machine printing, must be added c30 in the design, but simply add a color to see the blue light from the side, for the food industry, there is something wrong. Our experience: c60m60y40k100, such black is especially thick after the film.
 3, some people may say, I want to print black is simply c100m100y100k100 is not blacker? No! ! ! That way there is no way to print. Because the paper's ability to absorb ink is up to 300, which means that the sum of the four values ​​of cmyk cannot exceed 300! ! I am referring to a large area.
4. It is recommended to use high-quality paper when printing large areas of black, because good paper is not so much paper gray when printing, otherwise it is easy to dirty, if the printing master is slightly careless, then there will be a lot of dirty spots printed.
5, the pre-press design is also very important, if you use a reverse white when printing a large area of ​​black, do not use too small fonts, easy to paste.