HP C4912A No 82. magenta Inkjet Cartridge 69ml for Designjet 500/500PS/800/800PS. Page life - 6000. HP is known all over the world as one of the leaders in print technology and it has achieved this feat by constantly producing the very best items. The HP No82 Magenta Inkjet Cartridge follows this tradition, providing you with an easier way to get the sharpest and most defined prints. Perfect for us when printing high quality graphics and images, the cartridge works with absolute precision. Colours are kept separate, ensuring that they do not run and lose vibrancy.