If you have full-color photos or illustrations, you must have your piece printed with "process" inks. Process inks are cyan, magenta, yellow and black. These 4 inks can be combined to simulate almost any other color. For example, cyan and magenta can make blues and purples, cyan and yellow create greens and so on. If you're design requires many different Pantone colors you'd probably find it more price effective to print it with process inks.
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