Skin tones. Here, the Nikon D5100's Caucasian skin tones looked just about right in outdoor lighting using auto white balance, perhaps just slightly warm. Manual white balance produced slightly pinker tints, which had a "healthier" look. Where oversaturation is most problematic is on Caucasian skin tones, as it's very easy for these "memory colors" to be seen as too bright, too pink, too yellow, etc.