[kazinator]

> Of course, a reasonable question is why are blue and violet absorbed so strongly by these dust particles?

> Well, those are the only photons with enough energy to bump the dust molecules’s electrons up to a new energy state.

This is also why posters in a window turn blue. The warm-colored organic pigments that produce the yellows and reds do that because they absorb blue light and UV. And that light has the energy to knock apart their bonds and break them down. The dyes that absorb the lower energy waves, passing through blue, last longer resulting in bluing.