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Unfortunately, even within races there are various skin tones, so I'm not sure you'll ever be able to mathematically define them. On top of this, they will be under different lighting situations, sunlight, flash, etc. Then one person may be sick, another healthy, I can go on and on...
For white people if I'm stumped I'll aim for equal magenta and yellow and about half that value in cyan. However, because each photo is unique, I usually go for overall colour balance. If the trees look like the right kind of green, and the sky is the right kind of blue, then your skin tones are probably the way they were when the photo was taken.
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