You've propably had this experience: Your printer tells you it's time to change the cartridge, but you dismiss the message and keep printing. Days or weeks later, the cartridge still works, and you're thinking that rumors of its death were greatly exaggerated. Or perhaps your printer simply shuts down when it decides you've gone deep enough into its ink well, refusing to operate until you replace the cartridge.
PC World conducted lab testing on this matter, and the results confirm what you may have suspected: Many manufacturer-branded and aftermarket cartridges still contain a startling amount of ink when their host printers read empty. In fact, some inkjet printers force users to replace ink cartridges when the cartridge is nearly half full, PC World has found.