How to Clean an Old Copper Coin?

To clean an old copper coin using a simple method, you can try polishing copper with baking soda as described in a reference.

Simple Method for Cleaning Copper Coins

Based on the provided reference, a straightforward way to polish copper involves using a baking soda solution. This method is described as simple and requires minimal ingredients.

Here are the steps to follow:

1. Prepare the Solution: Pour 200 ml of hot water into a bowl.
2. Add Baking Soda: Add two spoonfuls of soda to the hot water. If you are cleaning a larger object, you might use slightly more water and soda proportionally.
3. Soak the Coin: Place the copper coin into the prepared mixture.
4. Wait: Leave the copper coin to soak in the solution for 5 to 10 minutes.

This process utilizes the properties of baking soda in hot water to help polish the copper surface.