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How do I make copper turn dark faster?

Im trying to make these cheap dollar store hoop earrings look old or "vintage". I already peeled of all the bright turquoise paint so its just shiny orange copper. How can I make it oxidize and turn a dark brown-ish color?

Public Comments

1. Heat them to boiling point then put outside for 48 hrs the oxygen in the air does the rest.
2. expose it to sulfuric acid (diluted). the sulfur will darken it