No. The
ultraviolet radiation that causes suntan does not pass through glass. A tan is the
skin 's natural defense against these harmful sun rays. Pigment cells in the
lower skin level make more pigment and melanin to absorb the ultraviolet rays. As
the pigment spreads into the
top layer of the skin, it becomes darker. (The Handy Science Answer Book,
compiled by the Science and Technology department of the Carnegie Library of
Pittsburgh)
