Through the glass after the sun came in with the glass can not be compared to those who will be the skin of the sun more black ah? Seek experts
Ordinary architectural glass generally can block 10% to 90% of the sun in the sun.
So, across the glass sun, the skin should not be easy to black.
So that the skin is black, is the sun in the ultraviolet.
Ultraviolet rays are wavelengths shorter than visible light. The wavelength is between 390 and 400 nm. It can pass through the air, but it is not easy to pass through the glass, has the ability to sterilize, and has some damage to the eyes and skin.
