Rich black is an ink mixture of solid black, 100% K, with additional CMY ink values. This results in a darker tone than black ink alone. If you print black alone as 100% K, the resulting black may not be as dark as you might like.
100% K on screen Rich Black

We recommend using
C 60 M 40 Y 40 K 100
This will give you a deep, dark, rich black.
Last Updated
12th of May, 2009