HP No. 78 Tri-Color Inkjet Print Cartridge (C6578DN)  Product Description: The HP no. 78 tri-color inkjet print cartridge provides outstanding plain-paper image quality, photo-image quality on special media, exceptional lightfastness, and the best combination of speed and print quality in any print mode. The HP no. 78 tri-color inkjet print cartridges also include a new printhead to automatically "tune up" the print quality with every cartridge replacement. Through a carefully crafted combination of ink chemistry, nozzle count, drop size, and firing frequency, the cartridge delivers unsurpassed HP print quality at top speed.Amazon.com Product Description: The Hewlett-Packard No. 78 tricolor print cartridges deliver an unparalleled combination of print quality, speed, reliability, and low cost per page. They feature precise, microfine drops and produce an outstanding print quality. HP's color layering technology provides smooth color transitions and realistic flesh tones. The following is a partial list of compatible printers: HP DeskJet 1220Cse, HP DeskJet 1220Cxi, HP DeskJet 930C, HP DeskJet 932C, HP DeskJet 935C, HP DeskJet 950C, HP DeskJet 952C, HP DeskJet 970Cse, HP DeskJet 970Cxi, HP PhotoSmart P1000, P1100, P1100xi, P1215, and P1215vm. Typical yields for these cartridges are 450 pages (C6578DN) and 970 pages (C6578A), based on 15 percent coverage. Average cost per page is eight cents (C6578DN) and six cents (C6578A).