- The patented, pigment-based ink in HP 56 Black Inkjet Print Cartridge ensures consistent results for a wide variety of printing. The reliable, easy-to-install cartridge and specially formulated ink deliver crisp, sharp results that resist fading. - A patented, pigment-based ink formulation and advanced cartridge technology in the HP 56 Black Inkjet Print Cartridge are designed together with the printer to provide consistently crisp, sharp, fade-resistant black text every time you print. - HP 56 Black Inkjet Print Cartridge delivers reliable performance and results. It works with the printer in a system designed for high-quality, dependable operation and results across a broad range of plain paper and HP specialty papers. - HP 56 Black Inkjet Print Cartridge is easy to install and use. An on-screen indicator monitors ink levels for timely replacement. The printing system design makes the cartridges easy to install and intuitively assures they are installed correctly.