he CLI-521C is one of the best cyan ink cartridges available on the market. It can be used for almost any purpose imaginable – printing any type of document that contains blue hues, creating vivid photographs with different blue tints, and for making sure that all your printouts are as close to those on the screen as possible. The CLI-521C has a very bright color that it imparts on all of the documents that you choose to print. It can create as many different hues of blue as possible to insure that you are always satisfied with the 11.5ml cartridges. The inkjet cartridge can be used with a number of different printers. It is compatible with the Canon IP 4600, Canon IP 3600, Canon MP 620, Canon M 540, Canon MX 860, Canon MP 550, Canon MP 560, Canon IP 4700, Canon MP 980, Canon MP 630, Canon MP 640, and the Canon MP 990.