Patent ID: 7388688

Claim:
A printing device, comprising: an ink cartridge installation component, in which is installed a first ink cartridge for inks having at least three chromatic colors, filled with chromatic colored ink, and in which is installed a second ink cartridge filled with chromatic colored ink that has a lower spectral reflectance when printed at a certain area coverage on a certain printing medium at each wavelength region in which the spectral reflectance of the inks having the at least three chromatic colors is greater when they are printed at a certain area coverage on the certain printing medium, the wavelength region resulting in a greater spectral reflectance when the inks are printed at a certain area coverage on a certain printing medium being a wavelength region where the spectral reflectance is greater than a first certain threshold, and the wavelength region resulting in a lower spectral reflectance when the inks are printed at a certain area coverage on the certain printing medium being a wavelength region where the spectral reflectance is lower than a second certain threshold; and a printing unit that ejects on to printing paper the ink received from the first and second ink cartridges.