How to Clean Old Coins
Coming across an old, rare coin can make a collector's day. Because most old coins were in circulation years ago, they can be very dirty. Coins found with a metal detector can be especially dirty, as they've been exposed to soil and weather for unknown periods of time. To get old coins in their best possible condition, they may need to be cleaned in a way that reduces damage to their surfaces.
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Instructions
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Consider showing the coin to a professional if you think it's rare and valuable. Trying to clean such a coin could significantly reduce its value.
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Verify the type of old coin that is in your possession. This can be done by checking the coin's date and mint mark, if it's visible and printed on the coin.
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Place the sink stopper in the sink's drain and rinse the coin under cold running water. Having the sink stopper in place will prevent the coin from going down the drain in case it slips from your fingers. Don't rub the coin while it's being rinsed. This can scratch it.
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Soak the coin in a small bowl of white vinegar for approximately five minutes.
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Rinse the coin again under cold running water. If it's clean, proceed to the drying step. If it's still not clean, continue with the next step.
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Return the coin to the small bowl of vinegar and let it stand for 15 minutes.
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Rinse the coin again under cold running water. If it's clean, proceed to the drying step. If it's still not clean, continue with the next step.
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Brush the coin with a very soft toothbrush. Brush only the soiled area and avoid applying too much pressure. If dirt still remains, use a magnifying glass and a toothpick to carefully chip off the dirt.
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Rinse the coin one final time under cold running water.
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Dry the coin with a soft cloth. Pat the coin dry rather than rubbing it.
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References
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