The most vibrant blue (like a sky blue) in the CMYK color space will be 100% cyan (100C) and about 70% magenta (70M). Any amount of the contaminating colors (in this case, yellow and black) will reduce the vibrancy. Yellow will "dirty" it up, and black will darken it. Of course, a lighter blue will have over-all lower ink percentages.
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how to convert to cmyk without losing color