
How do you clean old coins that are around 2000 years old?The metal work must remain perfect and be very clean
I believe the coins are made of bronze, silver, or gold.
Ancient coins are usually cleaned with a soft brush and a mild soap and water solution. If the coin can't be cleaned that way then it is time to either leave it alone or put it in olive oil for a time. This may take a month or two but the acid in extra virgin olive oil will clean the coin up with less damage then other systems. The value of the coin must be taken into consideration. Gold coins should be left to the pros to clean as well as most silver. Bronze and copper coins usually but not always have lower collector value but are the hardest to clean do to the metal is eaten away easily by soil. Any hard green stuff on the coin is the metal that was eaten into by the chemicals in the soil. Removing it will leave a hole. I use a Dremel motor tool with a flexible end to clean away dirt and stuff from ancient Chinese copper coins. One must be careful though. I don't clean modern coins at all and neither should anyone else.
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