An inkjet printer is a printing device that sprays colored liquid ink onto printing paper. It has one or more printing nozzles for printing ink of different colors. The technologies used in inkjet printers include bubble technology and thermal responsive inkjet technology. During the printing process, the nozzle quickly sweeps over the printing paper, spraying countless small ink droplets to form the pixels in the image. Generally speaking, the more nozzles there are, the faster the printing speed. Different colored ink droplets fall on the same point, forming different complex colors. Using a microscope, it can be observed that the areas where both yellow and blue purple ink are sprayed simultaneously appear green, so we can assume that the printed base color is formed in the inkjet coating layerÂ