The T0551 contains black ink for a wide variety of uses. These can be used for the house, such as when students need to print homework and readings, or at work, when office workers need to print files for storage and other similar things. Because the T0551 makes a very sharp, definitive black, it is preferable for most text printing, and can be used for other uses such as printing images. The colour of the cartridge is always a pure, bright black that is definitely the perfect colour for both formal documents and image printing. The 13.5ml cartridges are compatible with different printers such as the Epson Stylus Photo RX420, Epson Stylus RX425, Epson Stylus Photo R240, Epson Stylus Photo RX520, and the Epson Stylus Photo R245.