Sooner or later a piece of copper jewelry that you wear will turn dark red or some other color. It's known as the oxidation reaction. Somebody likes copper with this kind of “patina”, somebody likes it shiny.
Copper is very easy to clean and you can have your jewelry shiny again any time.
Instructions: For clean up use metal cleanser (e.g. paste Brasso, Sidol ). Put a small amount of this paste (or liquid) on the soft cloth and wipe the metal. Than buff your jewelry with a clean cloth only (no paste) until it gets shiny again.
When you're not wearing your jewelry, we recommend you storing them in a closed box to keep them shiny.