
The light rays can be classified according to their wavelength into UVA, UVB and UVC rays. UVA rays have longer wavelengths and therefore can penetrate deep into the skin. They turn brown, but do not build light protection. Ralf Blumenthal warns the Federation of Dermatologists (BVDD): "UVA rays are responsible for the aging of the skin, make it faster wrinkled and shriveled." Artificial sun rays, as in solariums, usually contain only UVA light.…