Budget and non-photo printers tend to contain cartridges with just the four standard colours (cyan, magenta, yellow and black - CMYK). In some cases the three colours are contained in a single cartridge so that when, say, the yellow runs out, you have to replace it even though you may have lots of cyan left. Single ink cartridges solve this problem, but at a slightly higher cost for a full set (though they can work out cheaper in the long run). For true photorealistic colour, though, four colours aren't enough to capture the subtle hues of real life, so manufacturers add intermediate colours such as light magenta, or photo cyan. More advanced printers may have up to eight separate tanks.

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