On items whose colors fade from sun, where does the color “go”?

Question

On items whose colors fade from sun, where does the color “go”?

In: 2

Answer 1

Color isn’t a physical thing with volume and mass, it’s a result of how light interacts with different substances.

UV light is very energetic and has a tendency to degrade some compounds – meaning that over time, a significant amount of the surface turns from the original chemical into various other ones, which might be a different color.