The name ChromaLife100+ is synonymous with quality and the Canon CLI-521 yellow ink cartridge is chock full of it. To be more precise there is 9ml of ink inside this cartridge and Canon recommend that, for the best results, you use their own photo paper because the two are designed to work in concert with each other. Yellow is often the least frequently replaced ink cartridge but you can buy this cartridge on its own rather than spend more money on extra ink that you don’t need yet.