Most printers start printing from the bottom to the top. In case you have a paper that has been printed already on the front side and want to print on the The standard colours of the printing industry are CMYK (Cyan, Magenta, Yellow, Black). These colours cover the light colour ranges easily in comparison to RGB (Red, Green Blue). Moreover, The CMYK can’t produce dark, but adding black or key colour K also gives a dark spectrum. Therefore, the CMYK covers a broader range of spectrum.