The hot summer is coming, and all kinds of outdoor activities and water activities are ready to go, but it is not easy to continue to be a gifted student with fair skin and healthy skin under the hot sun. Skin care products that are easy to use and effective in sun protection are absolutely necessary. However, do you have the same troubles in your heart, looking at the numerous products on the shelf, the dense symbols on the packaging, but not knowing which one is the real good sunscreen product?
The "long-wave UVA" in ultraviolet UV popular database is the key to tanning and aging of the skin Everyone should know that the culprit that turns the skin from white to black in summer is "ultraviolet rays (UV)", but you may not know the little secret of ultraviolet rays. Ultraviolet light is just a general term, and can be subdivided into UVC, UVB, short-wave UVA and long-wave UVA according to the wavelength from short to long. Among them, UVC has the worst penetration and is not easy to penetrate the ozone layer, so it has little effect on human skin, but UVB, short-wave UVA and long-wave UVA are different.
UVB will cause sunburn on the surface of the skin, while short-wave UVA will attack the next layer of epidermis to cause tanning, while long-wave UVA, which has the longest wavelength and occupies 75% of ultraviolet rays, will directly hit the deep dermis, compared with UVB and short-wave UVA. In addition, long-wave UVA is more chronic, deeper and more difficult to prevent skin damage.