Cleaning a Ten Yen Coin

What You Need:
- An old ten yen coin
- Lemon juice
- A bowl
- Paper towels

Steps:
1. Pour some lemon juice into a bowl.
2. Drop an old ten yen coin into the lemon juice.
3. Wait for five minutes.
4. Take the coin out of the bowl.
5. Use a paper towel and dry the coin.

Some More Fun:
- Try the same thing with different kinds of coins such as one yen and five yen coins. What do you see?
- Try it with other types of drinks such as tomato juice and milk. What do you see?