Is it possible to tan through the glass
Solar radiation causes darkening of the skin of a person, which is called a tan. It is believed that if sunlight falls through transparent objects, then all its rays completely reach the surface of the skin, so tanning in this case can also occur. But in reality it is not so: a person practically does not tan through the glass. This is explained by the fact that glass delays a 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 unnoticed, penetrating under the skin and affecting various internal processes. These rays reduce the amount of water, collagen and elastin in the cells of the epidermis, as a result, the skin ages 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 on oxidation can cause darkening of the skin.
Radiation In the shortwave, it causes the human melanocytes to produce melanin, as a result, the skin becomes darker. If the dose of this radiation is high, a burn may occur, and with regular exposure to a large number of type B rays, skin cancer appears.
Rays C almost do not reach the Earth’s surface, being absorbed by the ozone layer.
Tan through the glass
Glass only transmits long-wave radiation, and rays B is delayed, so melanin production under the influence of sunlight behind the glass is impossible. But the long waves of type A do not lose the ability to influence human skin: they not only cause aging, but also prepare the skin for exposure to rays B. With prolonged exposure to the sun penetrating glass, perhaps a slight redness, but not more: melanocytes do not work in this case. It is theoretically possible to tan through the glass, if you are constantly under radiation. But it will not be a tan in the literal meaning of the word: it is a thermal damage to the skin, which led to reddening.
It is the constant action of long-wave radiation that can explain why the hands of car drivers from the window darken after long journeys.
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