Sun tanning However, it operates not by inducing direct DNA damage, but by producing reactive oxygen species which damage DNA indirectly. UVA (see above) induces a cosmetic tan but little extra melanin protection against sun damage, sun burn, or cancer. Ultraviolet B (UVB) radiation is in the wavelength range 280 to 320 nm. Much of this band is blocked by the Earth's ozone layer, but some penetrates. UVB: A person's natural skin color affects their reaction to exposure to the sun. An individual's natural skin color can vary from a dark brown to a nearly colorless pigmentation, which may appear white .
The empire on which the sun never sets expression, the sun never sets in the Spanish dominions, but ever shines upon one part or other of them : which, to say truly, is a beam of glory [...]". Thomas Urquhart wrote of "that great Don Philippe, Tetrarch of the world, upon whose subjects the sun never sets." In the German dramatist Friedrich Schiller's 1787 play, "Don Carlos", Don Carlos's father, Philip II, says, "" ("I am called / The richest monarch in the Christian world; / The sun in my dominion never sets."). Joseph Fouché recalled Napoleon saying before the Peninsular War, "Reflect that the sun never sets