Color photographs are an inherently unstable medium, and are more susceptible to light and fading than black and white photographic processes. They are composed of various dyes, all of which eventually fade, albeit at different rates (causing discoloration along with fading). Many color photographic processes are also susceptible to fading even in the dark (known as "dark-fading"). There is little that can be done to restore faded images, and even under ideal conditions, most color photographs will not survive undamaged for more than 50 years.