This is a test of commonsense. Complete the next sentence:

How to age aluminum
Rough up the surface with sandpaper.
If you want a truly distressed and aged look, but are working with shiny, new aluminum, you can sand it down. Use 80-grit sandpaper to rough up the surface of the metal.
Spray your aluminum with bleach. Wear a mask and protective gloves when working with bleach.