Its UV or ultra voilet Radiation
What type of EM radiation tans human skin?
Physicists divide the ultraviolet spectrum into UVA, UVB and UVC bands. All will tan skin. UVC is very dangerous to skin, but is blocked by the atmosphere for the most part. UVB and UVA tan skin but are also dangerous and cause cancer. Unfortunately, most sunscreens only block UVB (see attached).
aspidistra
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