You can clean copper coins with lemon juice because the acid in the lemon juice removes the oxidation that makes the coins look dirty, leaving them shiny.
Why Lemon Juice Works: The Science Behind It
When copper mixes with oxygen in the air, a process called oxidation occurs. This is what makes copper coins look dull or dirty. Lemon juice contains citric acid, which reacts with the copper oxide (the "dirt" on the coin) and dissolves it.
Step-by-Step Guide to Cleaning Copper Coins with Lemon Juice
Here's a simple method to clean your copper coins:
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Gather your materials:
- Lemon juice (freshly squeezed or bottled)
- A small bowl or container
- Copper coins you want to clean
- Water
- A soft cloth or paper towel
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Soak the coins: Pour enough lemon juice into the bowl to cover the coins. Place the coins in the lemon juice and let them soak for 5-15 minutes. The amount of time needed will depend on how tarnished the coins are.
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Rinse the coins: Remove the coins from the lemon juice and rinse them thoroughly with water. This will remove the dissolved oxidation and any remaining lemon juice.
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Dry the coins: Gently dry the coins with a soft cloth or paper towel. Avoid rubbing too hard, as this could scratch the coins.
Important Considerations
- Avoid Prolonged Soaking: Soaking the coins for too long can damage them. Check the coins periodically during the soaking process.
- Do Not Use Abrasive Cleaners: Avoid using any abrasive cleaners or scrub brushes, as these can scratch the surface of the coins.
- Not for Valuable Coins: If you have valuable or collectible coins, consult a professional numismatist (coin expert) before cleaning them, as cleaning can sometimes reduce their value. This method is suitable for everyday pennies and other copper coins you simply want to make look nicer.
