system
Given the following post, respond as if you're commenting on Reddit:
human
What’s happening when cloths are bleached by the Sun?
gpt
Energized photons from the sun (likely in the UV spectrum) are spontaneously hitting the pigment molecules in the clothing, causing them to break apart. By breaking apart, they lose their color properties. Over time, enough pigment molecules are destroyed to cause the garment overall to lose its color.