system
Given the following post, respond as if you're commenting on Reddit:
human
Does Flash Really Damage Paintings? If So, How?

Photons are massless so how do they affect paintings.
gpt
Their spectrum reaches into the ultraviolet. UV can interact with electrons in molecules and can cause reactions. Such reactions can bleach out some pigments. You can see that on paints or coloured plastic bleaching when left in the sunlight.