When using black in a CMYK document, it is important to ensure that you consider the result you wish to achieve. If you use only the black channel with 100% coverage, the result will be more of a dark greyish or charcoal black. To get a rich, deep black, we recommend using a CMYK make up of 30/30/30/100 (that is 30% cyan, 30% magenta, 30% yellow and 100% black).