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Originally Posted by gal
This is called fluorescence. If you have anything in your body with this property I would say you're poisoned. What they probably mean is absorbtion of light. Your skin color can become visibly orange/yellow if you drink enough orange juice, so I guess it's possible to determine carotene content by analyzing absorbtion spectra.
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It can also turn orange if you eat too many carrots, interestingly enough.