Things You'll Need
Instructions
Acquire ancient coins, either online or through a reputable coin dealer. Be careful when looking for coins to make sure that at least some details are present. Never buy coins that are completely covered by dirt and patina.
Fill a plastic container with a few inches of distilled water and a small amount of dish soap. Let the coin soak in this solution for a few minutes.
Remove the coin from the solution and rub it gently with a soft toothbrush, being careful not to scratch the coin.
Apply a thin layer of petroleum jelly to the coin with a cotton swab. Remove the petroleum jelly with a different, dry cotton swab. This should help to get rid of some of the patina.