When skin is exposed to UVB light, cells called melanocytes in the deeper dermis layer of the skin produce increased amounts of melanin, the tanning pigment. This is then transferred to the top layer of skin, the epidermis. UVA acts upon the melanin near the surface by oxidising it. This turns the melanin brown and creates what we know as a tan.
UVB light also produces a thickening of the horny layer of the skin. This process, together with the protection from the oxidised melanin can create a level of sun protection in the skin.
The best way to create and maintain a tan is by encouraging the melanocytes to produce more melanin and then drawing it to the top layers of skin and retaining and oxidising it there.
This is done by exposing the skin frequently (3 times a week) via a series of tanning sessions which do not burn the skin (which is actually counterproductive and harmful).
All of the lotions that we provide are designed to encourage the melanin to rise to the surface of the skin and oxidise, hence accelerating the tan. Lotions also re-hydrate the skin preventing drying of the skin. If you over expose your skin to UV rays, your skin will likely burn or peel. This means your body is shedding melanin and therefore the skin is losing its tan and its protection.