illustration showing tarnished pots and lemon and salt
Illustration: Adam Howling
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Tarnished Copper

If you've got: tarnished copper

Ideal solution: Copper cleaner containing citric or oxalic acid, or a mild abrasive, such as fine red jeweler's rouge

In-a-pinch fix: Lemon juice mixed with rock salt

How it works: Air causes copper to oxidize and turn color. The acid from the lemon eats away at the oxidation, while the coarse salt provides a hefty dose of scouring power.
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