Coins turn rusty because they react with air and water over time. Imagine the coin is like a hungry person, it wants to eat oxygen from the air, and when there’s water around, it eats even more. This makes the coin change color and feel rougher.
Examples
- A copper penny left on a windowsill turns green after months in the sun.
- Coins in your piggy bank may look dull if they are left there for years.
- Old coins in your wallet might have a rough texture from oxidation.
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See also
- What Causes the ‘Rust’ on Coins?
- What Causes ‘Rust’ and Why Does It Happen More in Some Places?
- What Causes ‘Rust’ and How Is It Different from ‘Corrosion’?
- How Does a Coin Become ‘Rusty’?
- How Do Flames Actually Burn?
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