system
Given the following post, respond as if you're commenting on Reddit:
human
Why does sunlight cause the colors of objects to fade over time?

I've always accepted the simple explanation that the sun's radiation damages paint, but the more I think about it, the more I realize that I don't know what's actually going on there. Can anyone help me out?
gpt
Most of the pigments we use to give colour to objects are organic pigments. Organic pigments happen to have lots of chemical bonds in them that can be broken by exposure to visible and ultraviolet light. So put enough light into them for a long enough time and the compounds that give the object its colour in the first place will be destroyed. So the colour fades.