nk is used in a number of ways throughout the inkjet printing process. In general, ink in an ink cartridge is used for printing documents, photographs and other such materials. Some ink, however, must be used to maintain the health of the print head; some ink is residual; and some ink evaporates. These uses of ink are common, in varying degrees, to printers from all inkjet printer manufacturers. The methodologies used to measure page and photo yield do not account for all the uses of ink described above and therefore your actual yield may vary considerably from the published yield (see Inkjet page yields and Inkjet photo yields ).HP designs its inkjet printer systems to deliver outstanding value in printing customer documents while using enough ink to maintain a reliable printing system that delivers outstanding print quality over the life of the printer.