Several years ago I put a small icon of the Theotokos in my car. It stayed there all the time for several years. Over time I began to notice that it had lost its brilliancy of colors and now has a slightly white-washed look. I'm guessing this is all from the sun.
I have other icons inside my room, which are exposed, though to a lesser degree, to sunlight coming through my window. Should I be concerned about these icons fading in color over the years as well?
It really depends on the process used to reproduce any particular icon. A painted original icon would likely be less susceptible to fading than a photo or ink-jet related process. Do you have a UV filter-type glass in your windows? If not, I think there are products you can apply to the glass to cut the UV radiation of you can always use a combination of shades, blinds, shears and/or drapes. Good luck!
