Sunscreen
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Sunscreen
Sunscreen acts as a barrier to ultraviolet light, preventing the harmful rays from the sun burning our skin. When sunscreen is applied to a sheet of white paper that contains fluorescent whitening agents, the cream blocks the paper from the ultraviolet light and in turn, prevents the ultraviolet rays from being reflected back as visible fluorescents. In effect, the area where the sunscreen is, appears black under ultraviolet light because ultraviolet rays are being prevented from touching the paper.
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