Can I tan through glass
Can I tan through glass
The skin of a man is sunbathing under the influence ofcertain ultraviolet rays that are present in the solar radiation. Various objects - the foliage of trees, dense tissue and other opaque objects - delay this radiation, but the glass transmits light, so the myth is spread that through the glass you can tan. Unequivocally, it can not be refuted: part of the ultraviolet light still penetrates through it, but it is not enough to get a dark tan.
Ultraviolet
Solar radiation causes on human skindarkening, which is called sunburn. It is considered that if sunlight falls through transparent objects, then all its rays completely reach the surface of the skin, so a tan can also arise in this case. But in fact, this is not so: through the glass of a person practically does not sunbathe. This is due to the fact that the glass delays part of the radiation, which is responsible for the production of melanin in the human body. Ultraviolet radiation is divided into three types: A, B and C. The first is long-wavelength: these waves act imperceptibly, penetrating the skin and influencing various internal processes. These rays reduce the amount of water, collagen and elastin in the cells of the epidermis, resulting in skin aging faster. Long wave radiation can cause an allergic reaction and a slight reddening, but does not contribute to the appearance of sunburn, since melanin does not appear in the cells. Under its influence, only the precursors of this substance are formed - elements without color, which only during oxidation can cause a darkening of the skin. Radiation is short-wave, it causes melanocytes of a person to produce melanin, as a result, the skin becomes darker. If the dose of this radiation is high, then a burn may appear, and with regular exposure to a large number of rays of type B, skin cancer appears.The C-rays almost do not reach the surface of the Earth, being absorbed by the ozone layer.
Tanning through glass
Glass passes only long-waveradiation, and the beam B delays, so the production of melanin under the influence of sunlight behind the glass is impossible. But long waves of type A do not lose their ability to influence the skin of a person: they not only cause aging, but also prepare the skin for the effects of rays B. Long exposure to sunlight penetrating through the glass may cause slight redness, but no more: melanocytes do not work in this case. It is theoretically possible to get tanned through glass if one is constantly exposed to radiation. But this will not be a tan in the direct meaning of the word: it is thermal damage to the skin, which led to redness.It is the constant action of long-wave radiation that can explain why the hands of car drivers on the window side darken after long trips.All of the above applies to conventional window pane, other types - quartz or plexiglas - let the ultraviolet rays pass much better, they are used for tanning salons.
