Canon ink cartridges 40 41 are a set of cartridges that go in some of Canon's photo quality printers. 40 is the black cartridge and 41 is color. The color cartridge is by far the most expensive. Sometimes you can find a combo pack with both cartridges at a good price. If you shop around, you may be able to find a discounted 41 color cartridge, and then you can by the black cartridge in bulk.