HP No. 81 dye ink cartridges and printheads are designed to work with the HP Designjet 5000 series printers to provide the ultimate in photo-quality production printing. Six specially formulated, dye-based ink colors deliver the smoothest color transitions and wide color gamuts. Light cyan and light magenta, along with cyan, magenta, yellow, and black, produce a brilliant range of colors. Additionally, the high-capacity 680 ml ink cartridges are ideal for overnight or unattended production printing.