You can make old copper coins shiny using a simple solution of vinegar and salt. Here's how:
Steps to Clean Copper Coins:
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Prepare the Cleaning Solution: In a bowl, mix 1 teaspoon of salt with 1/4 cup of vinegar (white vinegar works best). Stir until the salt dissolves.
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Submerge the Coins: Carefully place the dirty copper coins into the vinegar and salt solution. Ensure the coins are submerged.
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Wait Briefly: Allow the coins to sit in the solution for about 20 seconds. Do not leave them in for extended periods (hours) as this can damage the coin's surface. The length of time depends on the level of dirt. For heavily tarnished coins, a minute may be required.
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Rinse Thoroughly: Remove the coins from the solution and rinse them thoroughly under running water. This is crucial to remove any residual acid.
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Dry Completely: Gently dry the coins with a soft paper towel. Avoid rubbing too hard, as this can scratch the surface.
Why This Works:
The acetic acid in the vinegar reacts with the copper oxide (tarnish) on the coin's surface. The salt acts as an abrasive and helps to speed up the cleaning process. The combination effectively removes the tarnish, revealing the shiny copper beneath.
Important Considerations:
- Authenticity & Value: Before cleaning any coins, especially older or rare ones, consult a numismatist (coin expert). Cleaning can sometimes decrease a coin's value to collectors.
- Safety: Although the solution is relatively mild, avoid getting it in your eyes or ingesting it. Wash your hands thoroughly after handling the coins and cleaning solution.
- Alternatives: Other cleaning methods include using lemon juice and salt or commercial copper cleaners. Always follow the product instructions carefully.
- Tough Stains: For particularly stubborn tarnish, you may need to repeat the process or gently scrub the coins with a soft toothbrush.
