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.
We recommend using
C 60 M 40 Y 40 K 100
This will give you a deep, dark, rich black.
*Products that are printed with dye-sublimation (9oz Premium Polyester Banner, Flags, Table Covers, Fabric Tube Displays, etc.) call for the following color values:
C 100 M 100 Y 100 K 100