Tips 1: Why the black color looks gray on the new paper cup digital printer

Tips 1: Why the black color looks gray on the new paper cup digital printer

When you get the new paper cup or paper bag digital printing machine, set up the new print head, testing on the CMYK files, you will find, that the black color looks not that black, but gray; Take it easy, it is normall; There are protect liquid inside the print head, the liquid will keep the print head wet, avoid blocking the tiny print holes on the print head, for such a long time shipping; 

How to fix it？Just keep printing the CMYK files，about 300P A4 paper，when the color turns to black and dry on the paper quick，then is ok for production；