CMYK blacks for book cover design

My printer (LSI) will not accept more than a total of CMYK = 240 (cool or warm black).

Once again, easy fix; use values for rich black. Rich black mixes in some cyan, magenta, and/or yellow to darken the 100% Key. There are many different opinions on what is best, but there are basically two kinds; warm and cool. Generally accepted values (in order of CMY) are 70, 50, 30 (known as “designer black”), 60, 40, 40 (cool black) and 40, 60, 40, (warm black). All of these are mixed with k=100.

via 3 Deadly Sins of Print Design | Fuel Your Creativity.

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