Most mirrors are technically white with a slight green tinge, according to BBC Science Focus Magazine. The reason for this is that color is a result of reflected light, and objects absorb some wavelengths of light while reflecting others. An object that appears red, for example, is simply reflecting red light. Objects that are black reflect no light. Because a mirror is designed to reflect all wavelengths on the visible spectrum, a perfect mirror would be white — the reflection of all colors. However, most mirrors reflect green light stronger than other colors because they have an underlying layer of silica glass, the atoms of which reflect green wavelengths more than other colors.