How to Store Coins Properly
Every collector knows the thrill of adding a new coin to their collection. But once it’s in your hands, how do you make sure it stays in the same condition for years — or even decades? Improper storage can quickly lead to scratches, spots, or unwanted toning, all of which can lower a coin’s value. Here’s a guide to keeping your coins safe and preserving their beauty.
Why Proper Storage Matters
Coins are made from metals that react to their environment. Humidity, air pollution, skin oils, and improper holders can all cause damage over time. Once damage happens, it can rarely be undone. Proper storage isn’t just about organization — it’s about protection.
Common Coin Storage Mistakes to Avoid
PVC flips: These clear, flexible holders contain plasticizers that can leach onto coins, leaving a sticky, green residue that permanently damages surfaces.
Cleaning coins: Using polish, soap, or chemicals almost always reduces value. Collectors should avoid “shiny at all costs.”
Attics and basements: High humidity, heat swings, and poor ventilation can speed up tarnish and corrosion.
Best Options for Coin Storage
2x2 Cardboard Holders: Inexpensive and widely used. Coins are sealed in with a clear window, then stored in boxes or binders. Great for casual collections.
Hard Plastic Holders: Airtight capsules or slabs offer excellent protection against air and moisture. Preferred for higher-value coins.
Albums and Folders: Fun for building sets (like Lincoln Cents or State Quarters). Choose archival-quality albums free of PVC.
Certified Holders (Slabs): Coins graded by PCGS or NGC are sealed in sonically-welded holders, providing long-term safety and strong resale confidence.
Environmental Protection Tips
Humidity Control: Store coins in a cool, dry place. Silica gel packs can help reduce moisture.
Temperature Stability: Avoid areas with wide temperature swings. A closet inside the home is usually better than a garage or attic.
Handling: Always handle coins by the edges, preferably with cotton gloves, to avoid fingerprints and oils.
What About Toning?
Some collectors enjoy natural toning, while others prefer bright original luster.
Proper storage slows unwanted toning but doesn’t always prevent it.
If you enjoy toned coins, store them in a way that allows natural aging without exposing them to harsh conditions.
Final Thoughts
Whether you’re just starting with pocket change finds or building a high-value investment collection, how you store your coins makes all the difference. Invest in safe holders, control your storage environment, and avoid common mistakes. Protecting your collection today ensures it can be enjoyed — and valued — for generations to come.