Biological evolution has given us a mechanism that helps us defend our skin from the sun. As soon as UV rays get to the skin it starts producing melanin, a protein that �transforms� almost all UV rays that get to the skin into heat. Melanin makes our skin go darker and this is the way we get tanned.�
The amount of melanin produced depends on the skin type each person has. It is known that people with fair skin and freckles have a phototype 1 skin and can get sunburns even by small amounts of sun. Black people have phototype 6 skin and they never get sunburns. Between these two types of skin, there is wide scale of phototypes.
The most frequent phototypes in