Ultraviolet rays are in each of the four seasons， winter sunlight is mild and the foggy， but ultraviolet ray only weaker than in the summer about 20%， will cause great harm to human skin and eyes， long-term ultraviolet irradiation is the most likely cause of the skin to produce all kinds of stains.

Ultraviolet light would make the dark skin， sunburn， long spot， wrinkles，serious word will make the skin produce phenomena such as skin cancer，but also because of the damage of UV on the skin is so large， so sun protection measures work， more can be said to be very important. So totest ultraviolet intensity for the beauty and pay attention to the health ofwomen is particularly important.

At present there is such a mobile phone chain test ultraviolet intensityappeared， in the absence of UV irradiation time mobile phone chain is white， ultraviolet stronger more purple. If you see the mobile phone chainto dark purple， it must take protective measures， it is very easy todamage the skin health.