Preserving Your Treasures: Expert Conservation Tips from the Spring PNNA Show

Introduction: The Conservationist’s Perspective

Throughout my years in numismatics, I’ve witnessed countless valuable pieces irreparably damaged by improper cleaning or storage. Here’s how to protect your collection for future generations.

Understanding Toning and Oxidation

One of the most frequent issues I encounter at shows like the Spring PNNA event is mishandling of toned coins. Natural toning, when properly preserved, can significantly enhance a coin’s numismatic value. However, many collectors mistakenly attempt to remove toning, unaware they’re destroying the coin’s surface and, consequently, its collectibility.

When examining coins with toning, it’s crucial to understand that toning is a natural process occurring when metal reacts with environmental elements. Silver coins, for instance, develop toning when exposed to sulfur compounds in the air. This creates a protective layer that, when stable, actually helps preserve the underlying metal.

Remember: Never attempt to remove toning from a coin unless you’re working with a professional conservationist. What appears to be tarnish might be the very thing that makes your coin valuable.

Identifying Harmful Oxidation

While natural toning is desirable, oxidation can be harmful. Look for these warning signs:

• Pitting or roughness on the surface
• Greenish deposits (indicating copper corrosion)
• Black spots that appear to be eating into the metal
• Any substance that appears to be growing or spreading

PVC Damage: The Silent Destroyer

Polyvinyl chloride (PVC) damage is one of the most insidious threats to coin collections. This damage occurs when coins are stored in soft plastic holders or flips containing PVC. Over time, the PVC breaks down and releases hydrochloric acid, which adheres to the coin’s surface.

The damage appears as a slimy, greenish residue that’s nearly impossible to remove without professional intervention. In severe cases, it can permanently etch the coin’s surface. I’ve seen coins that were pristine when placed in PVC holders emerge decades later with irreversible damage.

Proper Storage Solutions

To protect your collection from PVC damage, use only archival-quality holders. Look for products labeled as PVC-free, acid-free, and made from materials like Mylar or other inert plastics. The young numismatist I met at the show demonstrated excellent judgment in selecting proper holders for his acquisitions.

For long-term storage, consider these options:

• Air-tite holders for individual coins
• Archival-quality coin albums with proper interleaving
• Temperature and humidity-controlled environments
• Regular inspection of storage materials

To Clean or Not to Clean: The Eternal Question

This question comes up at every show I attend. My answer is always the same: unless you’re a professional, don’t clean your coins. I’ve seen countless examples where well-intentioned cleaning has destroyed a coin’s value.

Even professional conservation should be approached with caution. Before considering any cleaning or conservation work, ask yourself:

• Is the coin valuable enough to warrant professional treatment?
• Could cleaning potentially damage the coin’s surface?
• Would the coin’s value actually increase after conservation?

For most collectors, the best approach is prevention rather than correction. Proper storage and handling will preserve your coins far better than any cleaning attempt.

Proper Holders and Display

The variety of coins and currency at the Spring PNNA show highlighted the importance of using appropriate holders for different types of collectibles. Here are some guidelines:

For Coins

Slabbed coins (those in professional grading holders) are already protected and should be kept in their holders unless you’re having them resubmitted for re-grading. For raw coins, use holders that allow for easy viewing without removal.

For Currency

Paper money requires different protection than coins. Use acid-free currency holders or albums specifically designed for banknotes. The Bellingham, WA $20 national mentioned at the show would benefit from a holder that protects against light exposure and environmental contaminants.

For Tokens and Medals

These often have unique shapes and sizes, requiring custom holders or careful arrangement in drawers with proper padding.

Environmental Considerations

The venue for the Spring PNNA show, with its view of the Columbia River, reminded me of how environmental factors affect our collections. Humidity, temperature fluctuations, and even air quality can impact coins and currency over time.

Ideal storage conditions include:

• Consistent temperature (around 65-70°F)
• Low humidity (30-50%)
• Protection from direct sunlight
• Minimal exposure to air pollutants

Regular Maintenance and Inspection

Even with proper storage, regular inspection is crucial. I recommend examining your collection at least twice a year for any signs of deterioration. This is especially important for coins that have been recently acquired, as they may have been exposed to harmful conditions before entering your collection.

During inspections, check for:

• Changes in toning or color
• Signs of PVC damage
• Environmental damage from humidity or temperature changes
• Physical damage to holders

Conclusion: Preserving History for Future Generations

The Spring PNNA show demonstrated the vibrant community of collectors who understand the importance of proper preservation. From the young numismatist making informed decisions about his acquisitions to the experienced dealers sharing knowledge, the event highlighted how conservation knowledge is passed down through generations.

By following these preservation guidelines, you’re not just protecting your investment – you’re preserving pieces of history for future collectors to study and appreciate. Remember, the best conservation is preventive, and the most valuable coins are those that have been protected from the moment they left circulation.

As I’ve learned from decades in this field, a well-preserved coin tells a story that extends far beyond its face value. It’s our responsibility as collectors to ensure that story continues for generations to come.

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