HP pretty much invented desktop colour inkjet printing, launching its first DeskJet 500C model onto the market all the way back in 1991. For most of the time since then, HP has stuck rigidly to its dual black and tri-colour cartridge configuration, usually enabling you to swap out the black cartridge for an optional tri-colour 'photo' cartridge, boosting the ink range for six-colour photo printing.



Link: Techradar