Old coins maintained for collections must be carefully cleaned with non-abrasive materials and a solution that does not damage the metal compounds in the coin. Improperly cleaning a coin can damage it and substantially reduce its value. Specialists knowledgeable in coin cleaning can clean coins without damaging them. Most expert coin collectors advise against cleaning coins at all, as discolorations and dirt may actually increase a coin's value, explains NemisMaster.com.Continue Reading
To avoid damaging the coin, clean off grime and dirt by soaking the coin in a solution of mild soap and distilled water. Only soak the coin; do not rub it with an abrasive material or mix it around, as this may damage a delicate coin. Use only distilled water, not treated tap water that may contain chlorine and other chemicals that can damage the metal. After bathing them, allow the coins to air dry. Never rub the coins dry with any material, as even the softest cloths can cause damage.
A heavily encrusted or corroded coin can be cleaned by soaking it in olive oil. The coins should be soaked undisturbed, sometimes for months, to remove the dirt without damaging the coin. Ultrasound machines can also be used to clean coins.Learn more about Coins & Currency
Current prices of rare coins can be found through the websites for coin collecting and selling organizations, such as the Numismatic Guaranty Corporation or the Professional Coin Grading Service. Actual selling prices can also be found through online auction websites such as eBay,Full Answer >
Coin-sorting machines, or coin sorters, sort mixed coins into their respective denominations through a mechanical or manual process. For instance, they can separate pennies, nickels, dimes and quarters.Full Answer >
A good starting point when seeking buyers for old coins is heading to a local coin dealer. Coin World is a highly respected resource for the coin collecting community that features a user-friendly directory, which can help one locate nearby coin dealers.Full Answer >
Some rare U.S. coins a person might find in his coin jar include the 1995 double die penny, the 1943 steel penny and the "In God We Rust" 2005 Kansas state quarter. Other rare coins include the Ben Franklin half dollar and 1942 to 1945 silver nickels.Full Answer >