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Ultraviolet radiation

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Ultraviolet radiation, often called ultraviolet light (although it is invisible to the human eye) is a type of ionizing radiation.  It describes frequencies of the electromagnetic spectrum that are slightly higher than those of the visible color violet.

Prolonged exposure to ultraviolet radiation, which is a natural component of sunlight, puts a person at higher risk of skin cancer.  

Ultraviolet radiation is blocked by clear glass and zinc oxide ointments.  Melanin, a skin pigment, also effectively reduces ultraviolet exposure.  Most people produce melanin ("tanning") in response to exposure to ultraviolet radiation.

Ultraviolet at Wikipedia

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