When it comes to collectable coins, the less they get handled, the better. They’re best kept in a coin holder, with as little contact as possible. The better the quality of the coins, the more important it is to handle them properly.

If you have to handle them, it’s best to hold the coins on their edges. The less contact with your skin, the better. Fingerprints will quickly lower the value of uncirculated coins.

You also need to keep the coins away from your mouth. The moisture from your breath can eventually cause spots on the coin. Some collectors and dealers wear gloves and masks when handling coins.

If you need to place your coins on a surface, a clean, soft velvet cloth or pad is best. Don’t drag the coins across any surface. Scratches will greatly reduce the value.

Cleaning is another easy way to reduce the value of a coin, sometimes by as much as half. A shinny coin is only good when it’s the original shine. If a cleaning is absolutely necessary, the services of a professionally is strongly recommended.

Tarnishing’s a natural process called toning. When it looks good, tarnishing can increase the value of the coin.

If there’s dirt on your coins, you may be able to remove it by soaking them for a few days in soapy water or olive oil, then thoroughly rinsing with water. Don’t dry them by rubbing them. Rubbing the coin, even with a soft cloth will cause scratches.