How to Properly Store and Preserve a Rare 1838 Seated Liberty Dime: A Conservationist’s Guide to Toning, PVC Damage, and Long-Term Care

As a conservationist who has spent decades examining, cataloging, and preserving some of the most significant numismatic specimens in private and institutional collections, I can tell you without hesitation: I’ve seen too many valuable pieces ruined by improper cleaning or storage. The heartbreak never gets easier. A collector once brought me a coin that had survived nearly two centuries—only for us to discover that a well-meaning wipe with a household cloth, years in a PVC-laden soft flip, or a single season in a damp basement had irreversibly diminished both its eye appeal and its numismatic value. That experience changed how I approach this work, and it’s why I’m sharing these preservation principles today, using a fascinating case study that recently ignited passionate debate across the collector community: the 1838 “partial drapery” Seated Liberty dime, attributed as Fortin-108a.

This particular coin sparked a remarkably thorough discussion among experienced collectors, and the thread touched on nearly every preservation topic I care about deeply—toning, oxidation, PVC damage, proper holders, and the eternal question every collector faces: to clean or not to clean. Let’s use this remarkable variety as our guide and walk through the principles that every collector, investor, and historian needs to understand if they want to protect what they hold.

Understanding the Coin: Why the 1838 Fortin-108a Matters

Before we get into preservation technique, it’s worth understanding exactly what makes this coin so special. The 1838 Seated Liberty dime is one of the most sought-after early issues in the entire Seated Liberty series, and the “partial drapery” variety—cataloged as Fortin-108a—is a die variety recognized by PCGS that commands serious attention from variety collectors. As one forum contributor astutely noted, the clashed dies are what actually cause this variety, making it “probably more of a die state than a die variety,” though it carries official recognition nonetheless.

The population for this variety is notably low. That means even a well-worn example holds significant numismatic value and collectibility. This is precisely the kind of coin where preservation decisions carry outsized consequences—a mistake that might be tolerable on a common-date dime becomes a genuine tragedy when applied to a rare variety that may not surface again for years. When you hold a coin like this, you’re holding something genuinely irreplaceable.

Toning: Nature’s Patina and When to Leave It Alone

One of the most discussed aspects of this particular 1838 dime was its toning. The original poster noted that “there is some toning but that greenish glare in the obverse right field just happened to catch the light and looks excessively saturated.” Another collector responded warmly: “Sweet coin. I like the patina actually.”

This exchange captures a fundamental tension that runs through numismatic conservation. Toning—the natural chemical reaction between a coin’s metal surface and environmental elements over decades or centuries—is one of the most misunderstood phenomena in our hobby. Let me break it down as clearly as I can.

What Causes Toning?

Toning occurs when sulfur compounds, moisture, or other reactive elements in the environment interact with the coin’s surface. On silver coins like the 90% silver Seated Liberty dime, this process creates thin-film interference layers that produce the breathtaking rainbow collectors admire: gold, magenta, blue, and violet in concentric bands radiating outward from the coin’s center. The process is entirely natural and, in most cases, irreversible without damaging the coin’s original luster and surface.

Natural Toning vs. Problematic Discoloration

Not all toning is created equal, and learning to distinguish between them is one of the most valuable skills a collector can develop. Here’s how I break it down:

• Natural, attractive toning: Evenly distributed, with smooth color transitions and a pleasing visual effect that enhances the coin’s strike and design details. This type of toning often improves a coin’s grade and market value because it adds eye appeal without obscuring the original mint luster beneath.
• Excessive or uneven toning: The “greenish glare” mentioned in the thread falls squarely into this category. When toning becomes too heavy or concentrated in one area, it can obscure design details and suggest underlying chemical activity that may continue to degrade the surface over time.
• Active corrosion: Green, crusty, or powdery deposits that appear to be growing or spreading across the coin. This is not toning—it’s active deterioration, and it requires immediate attention before permanent damage sets in.

My advice, and I feel strongly about this: If the toning on your coin is stable, attractive, and not obscuring key design elements, leave it alone. The collector who said “I like the patina” was expressing a true conservationist’s instinct. Removing natural toning almost always reduces a coin’s value and can introduce micro-scratches that accelerate future degradation. That patina is part of the coin’s story—part of its provenance written in chemistry over nearly two centuries.

PVC Damage: The Silent Killer in Your Collection

The most alarming observation in the forum thread came quickly: “Yuck looks like pvc.” This single word—”PVC”—should send a chill down every collector’s spine, and if it doesn’t yet, it will after you read this section. Polyvinyl chloride, the chemical compound found in many soft plastic coin flips and older holders, is one of the most destructive forces acting on coins in private collections today. I’ve personally witnessed its devastating effects on coins that deserved far better.

How PVC Damages Coins

PVC is inherently unstable at the molecular level. Over time, it off-gasses hydrochloric acid, which reacts with the metal surface of coins to form greenish, sticky corrosion products. This damage is progressive and cumulative—it never stops on its own. A coin stored in a PVC flip for five years may show only a faint green haze that’s easy to miss. After twenty years, the surface may be permanently etched and pitted, destroying the original luster forever.

Identifying PVC Damage Early

The good news—and this is genuinely important—is that early-stage PVC damage is often identifiable and, crucially, reversible if you act quickly. Look for these warning signs every time you examine your collection:

1. A greenish or cloudy film on the coin’s surface, often most visible in the open fields around the design
2. A slightly sticky or tacky feel when the coin is handled with clean, dry hands
3. A faint chemical odor when the coin is first removed from its holder
4. Glare or iridescence that seems to shift unnaturally under light—exactly what the original poster described as a “greenish glare”

The forum contributor who noted that PVC damage “can easily catch the light” was describing a textbook presentation. That excessive saturation in the obverse right field? It may very well be the early stages of PVC interaction with the silver surface. If that’s the case, time is not on your side.

The Acetone Remedy: A Conservationist’s Best Friend

This is where the forum discussion offered genuinely sound advice: “If there’s pvc, it’s easily rectified with a bit of acetone.” I want to expand on this significantly because the technique matters enormously, and getting it wrong can cause additional harm.

Pure acetone—and I cannot stress the word “pure” enough—is one of the safest solvents for numismatic conservation. Unlike nail polish remover or other commercial products, 100% pure acetone dissolves PVC residue without reacting with silver or copper. It essentially lifts the contaminant away without touching the coin’s original surface. Here is my recommended procedure, refined over years of practice:

1. Purchase 100% pure acetone from a hardware store or chemical supply company. Read the label carefully—absolutely no additives, fragrances, or moisturizers.
2. Work in a well-ventilated area, away from any open flame. Acetone is highly flammable and produces strong vapors that can cause dizziness.
3. Place the coin in a glass or ceramic container—never plastic, as acetone will dissolve many plastic materials.
4. Submerge the coin completely and allow it to soak for several minutes. Gently agitate the liquid. Do not rub, wipe, or scrub the coin’s surface under any circumstances.
5. Remove the coin and allow it to air-dry on a clean, lint-free cloth or tissue. Do not rinse with water afterward.
6. Repeat the process if necessary for stubborn residue. Patience is key.

Critical warning: Acetone removes PVC residue. It does not remove toning, and it does not repair surface damage that has already been etched into the metal. If PVC exposure has been prolonged enough to permanently mark the coin’s surface, that damage cannot be undone. This is precisely why early detection and immediate action are so important. Every month you wait is a month the acid continues its work.

Proper Holders: Your First Line of Defense

Once you’ve addressed any immediate threats like PVC contamination, the next step is ensuring your coin is stored in an appropriate holder. This is where I see many collectors unknowingly cause long-term harm, often with the best of intentions.

Holders to Avoid

• Soft PVC flips: The single most common offender in the hobby. These inexpensive flips are made with PVC plasticizers that will eventually damage any coin stored in them, regardless of the coin’s rarity or value. If your coin came in one, transfer it today—not tomorrow.
• Cardboard flips with PVC windows: Some cardboard 2×2 flips have a PVC window rather than a safe alternative. Always check the window material—Mylar or acetate windows are safe; PVC is not.
• Rubber bands, paper clips, or adhesive mounts: These can scratch, corrode, or chemically react with the coin’s surface. I’ve seen coins permanently marked by a rubber band left in place for just a single summer.
• Airtight containers without climate control: Sealing a coin in an airtight environment without controlling humidity can trap moisture inside and accelerate corrosion from the inside out.

Holders I Recommend

For a coin as significant as the 1838 Fortin-108a dime, I recommend the following storage hierarchy based on the coin’s rarity, condition, and long-term preservation needs:

1. PCGS or NGC certified slab: If the coin is professionally graded, the slab itself is an excellent long-term holder. These sonically sealed holders use inert materials and provide both physical protection and a stable microclimate. As one forum member wisely noted, submitting this variety might be worthwhile given its low population—though existing surface marks are a factor to consider honestly.
2. Mylar flips (hard plastic): For raw coins not yet certified, Mylar (also known as Melinex) flips are the gold standard. They are chemically inert, crystal clear for viewing, and provide reliable protection for both storage and careful handling.
3. Archival-quality 2×2 cardboard holders with Mylar windows: Acceptable for short-term storage and transport, provided you verify the window material is genuinely Mylar or acetate rather than PVC.
4. Intercept technology holders: These newer products use copper-infused polymer to actively neutralize corrosive gases in the storage environment. They represent the current cutting edge of numismatic storage technology and are well worth the modest investment for high-value pieces.

To Clean or Not to Clean: The Conservationist’s Dilemma

This is the question I am asked more than any other, whether I’m at a coin show, answering emails, or examining a new acquisition. My answer is always the same: do not clean your coins. But the reality is more nuanced than that blanket statement, and I owe you a fuller explanation.

Why Cleaning Is Almost Always Wrong

Every cleaning method—whether it’s a gentle wipe with a microfiber cloth, a dip in a commercial solution, or an abrasive polish—removes a microscopic layer of metal from the coin’s surface. This destroys the original mint luster that took form the instant the dies struck the planchet. It disrupts the natural patina that developed over decades or centuries. And it introduces artificial characteristics that experienced graders and seasoned collectors can detect immediately, often under modest magnification.

A cleaned coin is, in the eyes of the market, a damaged coin. The value reduction can range from 10% to 90% depending on the severity of the cleaning and the rarity of the coin. On a common date, this might represent a minor financial disappointment. On a low-population variety like the Fortin-108a, it could be absolutely devastating—both financially and historically.

The Exception: Removing Active Threats

There is one important exception to the “never clean” rule, and it’s the situation we’ve already discussed: removing PVC residue with pure acetone. This is not cleaning in the traditional sense—it’s conservation. You are removing a foreign, actively damaging substance without abrading or altering the coin’s original surface in any way.

The distinction is critical, and I want to be precise about it:

• Cleaning: Removing toning, dirt, or “ugly” appearance to make a coin look more superficially appealing. Never do this, regardless of who suggests it or how harmless it seems.
• Conservation: Removing a substance that is actively and progressively damaging the coin’s surface. Do this carefully, with the right materials, and only when genuinely necessary.

What About Those Scratches?

The forum thread mentioned “a couple of wispy hairline scratches” on the dime, and one collector noted they “don’t distract overall.” Another expressed concern about how the scratches might affect the coin’s grade if it were submitted for professional certification. This is a judgment call that depends entirely on your goals for the coin.

From a conservationist’s perspective, scratches are part of a coin’s history. They tell the story of how the coin was handled, stored, and circulated over nearly two centuries of existence. Attempting to remove or disguise scratches through any mechanical or chemical means will cause far more harm than the scratches themselves ever could. If you plan to submit the coin for professional grading, be aware that surface marks will affect the assigned grade—but an honestly worn, naturally toned example with good eye appeal will always be more desirable to serious collectors than a coin that has been “improved” by human intervention.

Environmental Controls: The Bigger Picture

Proper holders are only part of the preservation equation. The environment in which you store your collection matters enormously, and it’s an area where many well-meaning collectors fall short without realizing it.

Temperature and Humidity

Ideal coin storage conditions mirror those of a professional museum:

• Temperature: Stable, between 65°F and 70°F (18°C to 21°C). Avoid attics, garages, and basements where temperature fluctuates dramatically with the seasons. Rapid temperature changes cause condensation, and condensation causes corrosion.
• Relative humidity: Below 50%, ideally between 30% and 40%. High humidity accelerates toning, oxidation, and corrosion in ways that may not become visible for years. In humid climates, use silica gel packets or a dedicated dehumidifier in your storage area, and monitor conditions with a simple hygrometer.
• Light exposure: Store coins in the dark whenever possible. Prolonged exposure to UV light—including direct sunlight and fluorescent lighting—can accelerate toning and discoloration unevenly across the coin’s surface.

Handling Best Practices

• Always handle coins by the edges, never by the obverse or reverse faces. The oils and moisture from your fingers can leave marks that develop into permanent spots over time.
• Wash and dry your hands thoroughly before handling, or wear clean cotton or nitrile gloves. I prefer nitrile because cotton fibers can sometimes catch on sharp design elements.
• Handle coins over a soft, clean surface to minimize damage from accidental drops. A velvet pad or folded microfiber cloth works perfectly.
• Never talk over an unprotected coin. This sounds fussy, I know, but moisture from your breath can cause localized spotting that becomes visible months or years later.

Die States, Remarriages, and the Importance of Documentation

One of the most intellectually exciting aspects of the 1838 Fortin-108a dime, as highlighted in the forum thread, is its significance for “die-state and remarriage studies.” This is a dimension of numismatics that goes well beyond simple preservation and enters the realm of genuine historical scholarship.

The Seated Liberty dime series is renowned for its complex die marriages, and the 1838 issue is particularly rich in die varieties. The “partial drapery” characteristic of the Fortin-108a is the result of die clashing—a phenomenon where the dies strike each other without a planchet between them, transferring design elements from one die to the other in a distinctive pattern. Understanding and carefully documenting these die states contributes to our broader knowledge of minting practices, die life, and production methods in the 1830s.

My strong recommendation: If you own a coin with documented die variety significance, photograph it thoroughly under multiple lighting conditions—diffused, raking, and direct—record its exact weight and diameter, and maintain a written provenance tracing its ownership history as far back as you can. This documentation preserves the coin’s scholarly value even if the physical specimen is ever compromised by accident or time. Share your findings generously with the numismatic community. Organizations like the Liberty Seated Collectors Club maintain die variety databases that depend entirely on collector contributions, and your observations could fill gaps that have puzzled researchers for decades.

Actionable Takeaways for Buyers and Sellers

Whether you are acquiring, holding, or selling a coin like the 1838 Fortin-108a dime, here are the preservation principles I want you to carry with you:

1. Inspect every coin you acquire carefully for PVC damage, active corrosion, and improper storage residue. Address any issues immediately—procrastination is the enemy of preservation.
2. Transfer coins from PVC flips to Mylar or certified slabs as soon as possible. This single step prevents the most common and most preventable form of storage damage in the hobby.
3. Never clean a coin for aesthetic reasons. Use pure acetone only to remove PVC residue or other foreign contaminants that are actively threatening the surface.
4. Control your storage environment. Stable temperature, low humidity, and darkness are your most reliable allies in long-term preservation.
5. Document die varieties and provenance meticulously. The scholarly value of a coin is an integral part of its total worth—both to you and to the broader community.
6. Consider professional grading for rare varieties, but weigh the cost honestly against the coin’s current condition and population rarity. Not every coin needs to be slabbed.
7. Handle with care, store with intention, and pass it on responsibly. You are a steward of history, not just an owner. Act like one.

Conclusion: A Legacy Worth Protecting

The 1838 “partial drapery” Seated Liberty dime, Fortin-108a, is far more than a collectible. It is a tangible artifact of early American minting, a product of the Philadelphia Mint’s craftsmanship in an era when every die was hand-punched and every strike was a small act of industrial art. Its low population makes each surviving example genuinely precious. Its die-clash origins make it a window into the mechanical realities of 19th-century coin production. And its survival—through nearly 190 years of economic upheaval, two world wars, and countless changes in ownership—makes it a testament to the enduring human impulse to preserve and value beautiful objects.

As collectors, investors, and historians, we are temporary custodians of these pieces. The decisions we make today about storage, handling, and conservation will determine whether the next generation inherits coins that are vibrant, intact, and rich with historical information—or coins that have been diminished by ignorance, neglect, or well-intentioned but misguided intervention.

I’ve examined thousands of coins in my career, and the ones that move me most are the ones that have been treated with genuine respect. A naturally toned, honestly worn 1838 dime in a proper holder tells a complete and compelling story—one that begins at the Philadelphia Mint in 1838 and continues through every careful owner who chose preservation over alteration. A cleaned, scratched, PVC-damaged example tells a different story entirely—one of missed opportunities and irreversible loss.

Choose preservation. Choose patience. Choose to let history speak for itself. The coins in your collection deserve nothing less, and frankly, so does the hobby we all love.

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