Amber glass, for example, gets its color from the addition of carbon, iron, and sulfur. Cobalt blue glass gets its color from the addition of cobalt oxide. Green glass gets it color from non-toxic chrome oxide, and red glass gets its color from selenium oxide, copper, or gold chloride.

Why are amber bottles colored?

UV Protection.

Amber glass bottles provide excellent UV protection for the contents. This is important because UV rays can sometimes change the components of the contents. This photo-oxidation is what causes the beer to go "skunky." If your product is at risk for spoiling due to UV rays, amber glass can help.

Is amber a color?

The color amber is a pure chroma color, located on the color wheel midway between the colors of yellow and orange.