We combined the yellow dye, which is a molecule that absorbs most light, especially blue and ultraviolet light, with skin, which is a scattering medium. Individually, these two things block most light from getting through them.
The 'magic' happens because dissolving the light-absorbing molecules in water changes the solution's refractive index ... in a way that matches the refractive index of tissue components like lipids.
As soon as we rinsed and massaged the skin with water, the effect was reversed within minutes.
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