Why is amber glass sometimes preferred over clear glass?
Amber glass blocks all radiation from 350 to 200 nanometers. UV radiation in the 10-200 nanometer range is called short wavelength UV and is absorbed by the air. The UVC range is 200-280 nanometers and refers to shorter UV wavelengths. They are often used for germ killing purposes. The UVB range is 280-315 nanometers and is the Ultraviolet zone that causes sunburn. The UVA range is 315-400 nanometers. Tanning spas operate in the 315 to 345 nanometer range. As you can see, not all UV radiation is blocked by the amber glass, but a large portion of it is.
