Read this tip to make your life smarter, better, faster and wiser. LifeTips is the place to go when you need to know about Printing Basics and other Printing topics.
It's best not to colorize small text. All printing presses have a little bit of variance in the consistency of the position of the different color plates. This is called misregistration.
In misregistration, cyan, magenta, yellow and black portions of the text characters don't line up exactly. As a result, little colored halos appear around the characters.
It's ok to use colored text on large, headline type, or smaller sizes down to about 12 point size, but much smaller than that will be too noticeabl. The same thing holds true for white (knock-out) text on a dark or colored background. You can do it but don't use point sizes smaller than about 12 point. Otherwise the words may be hard to read and it will look unprofessional.