The use of Rich Black is strongly not recommended for small text or thin lines because this combination is constructed from four CMYK inks through the Four-Color Process. Even the slightest registration error on press will cause a color misalignment, resulting in a visible halo or rainbow effect around the text, which severely compromises legibility and clarity. This risk of color fringing is the primary reason why designers must exercise caution with this mixture.

The standard and safer alternative for any small text, intricate details, or fine lines is to use 100% Black (Key Color) exclusively. This ensures that the text prints from only one plate, eliminating the possibility of registration issues. Furthermore, Rich Black application must be managed carefully for its intended use, typically large solid areas or backgrounds, where it is used more frequently in Offset Printing than in other processes like Flexography. For all applications, the final Rich Black element must be set to Overprint in prepress to avoid unnecessary knockout issues.