Advanced Color Issues for Identities
The most exquisite design can be nullified by bad color choices. It's not rocket science. But there are set principles one needs to learn.
Logo and Signature Color Basics
Maintaining contrast in an identity is essential for it to fulfill its primary function: to be easily seen and recognized.
Deadly Sin of Logo Design #3: Obscure Contrast
It doesn't matter what you've designed if it can not be seen. Contrast is a physical reality rooted in value.