Wouldn't it be great (for image artists) if you could arrange to have all your light sources share the same temperature? Unfortunately, that doesn't happen in real life, and between flash, tungsten lights, fluorescent lights, and sunlight, you may find yourself with a mixed lighting bag. No single white balance setting will correct the entire image, so you have to resort to local corrections.
In this video, I'll show you a technique in Photoshop for selecting the contaminated color areas easily, then a way to match the color of these areas to the rest of the image using some layer blending mode tricks. [More]