Caring for Your Coin Collection

To retain the value and look of your coin collection, proper care and storing are essential.

While you may be tempted to polish your coins to make them look shiny and new, proceed with caution. Polishing and/or cleaning coins can reduce their value. Older coins that show deep age coloration are more desirable than coins whose surfaces have been stripped away by improper polishing or cleaning.

If you do polish a coin to remove dirt, use mild soap and water. Once you’ve washed the coin, pat it dry with a soft towel. Brushing or rubbing can scratch a coin’s delicate surface.

Keep coins cool and dry

Sharp changes in temperature and moisture cause discoloration that devalues coins. Avoid talking directly over coins; tiny droplets of saliva can also create spots on a coin. Just like fingerprints, these marks are difficult to remove.

Use original holders

All modern coin sets and coins should be bought and sold in original cases and capsules. The Mint sells coin sets in protective plastic cases called lenses or in folders. Individual coins are packaged in capsules fitted into folders or boxes.

In addition to original holders, other storage options include:

• 2" x 2" cardboard or plastic holders
• Plastic tubes or capsules
• Sleeves or envelopes
• Albums

For high-value coins, use hard plastic holders. Professional coin grading services use sealed holders called slabs to protect authenticated and graded coins.

Use acid-free cardboard and plastic holders free from polyvinyl chloride (PVC). Acid and PVC can ruin a coin’s surface. PVC eventually coats a coin with sticky green slime.

Save documentation

Some coins and coin sets come with a certificate of authenticity and/or an information card.

Keep them safe

A safe-deposit box at a bank is ideal. If you have a home collection, ensure that your home insurance covers full replacement costs.