Usually, inkjet printers are used by people who print very little. The ink comes in special ink cartridges, which can be very expensive and uneconomical. Also, the ink in the cartridge may dry up. This means that a new cartridge is needed. Three colors of cartridges, which combine magenta, yellow and cyan inks are used to create color tones. A black cartridge is also used for crisp monochrome output. Some professional printers have one or more additional colors for better photo quality, such as light cyan, light magenta, blue, red, green, orange, and grey.