First DO NOT clean valuable coins. Most collectors rarely clean a coin as it can greatly reduce its value. If you have some smaller value coins like Dimes or Penny’s then this article is for you. Patina is the thin layer of tarnish that develops on a coin over many years and many collectors appreciate this. It is best not to clean this off expensive coins as the value can be reduced. 99% of coins do not increase in value after you clean them but if you have some old coins you wish to clean, try these steps.
If it is still dirty you can use light brush for caked on dirt. Dry the coin with a soft lint free cloth. Do not rub coin just let it dry in the air.
Same process as above and a soak for 5 minutes in lemon juice help to keep the coin shiny.
It is best to soak them for a few weeks in olive oil, as its very gentle way to dissolve the dirt without harming the coin. If some dirt is left you can use a toothpick to clean the coin.
The effect is immediate. You can use ketchup or tomato paste as it is also acidic.
Do Not use this on valuable coins and be careful not to get any in your eyes.
Soak them in warm soapy water only. Gold is too valuable to risk damage.
These are mainly ancient or old coins and wash them in distilled water not tape water.
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