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.