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This is how you measure colors in many applications not just skin, reflectance at different wavelengths with a spectrometer.
I think we are just accustomed to see reddish tones as lighter for skins but metrically it isn't, although one can argue a lighter skin reflects more of the blood vessels, makes it...darker, it may be valid for some NW populations like Irish but i think elsewhere it's rather because people really have more yellowish tones.
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