However, matter that gets close to the black hole will. This typically happens when a galaxy collides with another galaxy or two galaxies have a close encounter. When two galaxies get close to each other, they exert strong tidal forces on each other. That perturbs the motions of gas clouds. Such energetic events are known as quasars.
All quasars are very distant.
Perhaps our Milky Way was once a quasar because it may have had a black hole and been involved in collisions with other galaxies. Such collisions would have been quite frequent early in the universe's evolution, when the galaxies were much closer to each other than they are today. The HST color images are produced by combining three images of the same object taken through different filters. It's quite similar to the way ordinary color film works, which consists of three emulsion layers sensitive to different colors. You raise the question of whether the HST colors are artificial.