How to Clean Uncleaned Ancient Coins

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Cleaning
Some coins clean up quickly, in just a few minutes, some take a couple of weeks gently soaking, and some can soak for a year or more. It is also important to know that all coins will be in different conditions. Some will clean up and look like new, but this will be an exception. Most should clean and show at least some detail, but a few will never clean, no matter how hard you scrub.

Soap
The simplest method of cleaning coins is to soak them in warm soapy water, then gently scrub them with a nylon brush under running water. This is probably the most time consuming method of cleaning but it is one of the safest. Soak all new uncleaned coins for 10-15 minutes, give them a quick brush, dry them off, and have a look. If they are done, put them aside, if not, move on to another method.

Distilled Water
This has recently become of the most popular ways to clean off your crusty coins. All that you need to do is to soak the coins in distilled water and scrub them with your nylon brush. This works because distilled water does not contain any minerals suspending in the water. Because the water in mineral hungry it will attract the minerals contained on the coins and breaks the chemical bonds that hold the dirt to the coin. You need to change the water every week or so, but given some time the coins gradually shake off their crust.

Olive Oil
Olive oil has traditionally been the most common method of cleaning used on ancient bronze coins. You start off by soaking then coins for at least one week in olive oil. If you can let them soak longer the oil will penetrate better and loosen more of the dirt. After soaking the coins in oil, take them out and clean them off with some soapy water. This should take most of the oil residue off. You then give them as little scrub with a nylon brush, or for more stubborn coins, a soft brass brush. Dry the coins off, take a look, and repeat as necessary. Many people will leave coins for a year or more in olive oil, every month or so, you check the coins, give them a little scrub, keep the clean coins, change the oil and put back any that are not yet clean
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