There is a lack of confident knowledge about the properties and usefulness of sunblock. Sunblock is intended to protect the skin from ultra violet electromagnetic wavelengths. This is a portion electromagnetic spectrum which is invisible to human sight. There are several categories of ultraviolet light. There is ultra violet A, B, and C. Each of them have different affects on the body and highly dangerous.
Ultraviolet A (UVA) waves are between 320 nm and 400 nm in length and damage the collagen in the skin, causing it to lose elasticity and begin to wrinkle. Ultraviolet B (UVB) waves are between 290 nm and 320nm in length and cause the skin to tan and burn by stimulating the melanocyte cell. In addition, it is known to have a carcinogenic effect by “a process of direct photochemical damage to DNA from which gene mutations arise”1. As it is believed of now, ultraviolet C (UVC) is not as much of an issue because the ozone blocks a majority of these waves, but with the depletion of the ozone this will become more of an issue.
