Whether you're aware of the correct terminology or not, you have likely experienced color contamination happening in your photographs already. Put simply, color contamination is when one color is affected by the presence of another color in close proximity.
If you're new to the world of studio portraiture and you've noticed that the skin tones in your photos are often turning out wrong, it's possible you're getting color contamination from the ambient lights in your studio -- be that a bank of windows or overhead lights.
Lindsay Adler and CreativeLive want to help you clear that up, and so they've published this short snippet of their Skin 101 course to explain how best to avoid this issue.