There are four types of finishes available. In order to get the black on the pieces - called a patina - I use a chemical called Liver of Sulfur.
Shiny finish with patina: this gives the prints a blackened look, only the prints and lettering are black, not the whole piece. The shiny finish gives it a classic look.
Shiny with no patina: this gives the piece an understated look, there is no black on the piece at all.
Matte finish with patina: this gives the piece a more contemporary look, while still looking understated and the patina makes the prints stand out.
Matte finish with no patina: a very simple but contemporary, understated look.