How to Properly Store and Preserve Civil War Tokens and Early American Numismatic Treasures: A Conservationist’s Complete Guide

“I’ve seen too many valuable pieces ruined by improper cleaning or storage. Here is how to keep yours safe for the next generation.”

As a conservationist and numismatist who has spent decades examining, grading, and preserving some of the most significant pieces in American numismatic history, I can tell you with absolute certainty: the single greatest threat to your collection isn’t theft, market fluctuation, or even natural disaster. It is improper handling, cleaning, and storage. I have personally witnessed thousands of dollars in numismatic value — and irreplaceable historical significance — destroyed in moments by well-meaning collectors who simply didn’t know better.

Recently, a fascinating thread on a popular numismatic forum caught my attention. A collector named DCW shared an extraordinary advertisement from the New York Tribune, dated April 8, 1861 — the very eve of the Civil War. The ad featured four prominent merchants who were each prolific issuers of their own Civil War storecards: Alfred S. Robinson, Edward Cogan, M.L. Marshall, and John K. Curtis. The thread also referenced the famous JNT Levick — known for the legendary “Smoking of the Weed” token — visiting his friend Alfred S. Robinson. These aren’t just coins. These are history — tangible artifacts from a nation on the brink of its most defining conflict. And they deserve to be preserved with the utmost care.

In this guide, I’ll walk you through everything I’ve learned about preserving Civil War tokens, early American storecards, and exonumia of this era. Whether you’re a seasoned collector or have just acquired your first piece, the principles below will protect your investment and ensure these artifacts survive for generations to come.

Understanding What You’re Preserving: Civil War Tokens and Their Significance

Before we get into preservation techniques, it’s worth understanding exactly what these objects are and why they demand special care. Civil War tokens were privately issued pieces, typically struck in copper or brass, that circulated as substitute currency during the Civil War era (roughly 1861–1864) when government-issued coinage was hoarded and became scarce.

The four merchants featured in that New York Tribune advertisement represent some of the most collectible names in the Civil War token hobby:

• Alfred S. Robinson — A well-known Philadelphia merchant whose storecards are highly sought after. His pieces often feature detailed die work and are found in varying states of preservation, making high-grade examples particularly desirable.
• Edward Cogan — One of the most prominent coin dealers of the 19th century. Cogan’s tokens are prized for their historical significance and relative scarcity, and they consistently command strong prices when they appear at auction.
• M.L. Marshall — Known for tokens advertising “Toys, Fancy Goods, Fishing Tackle and Rare Coin,” Marshall’s establishment was evidently quite the destination. His tokens are beloved by collectors for their colorful advertising copy and strong eye appeal.
• John K. Curtis — Another prolific issuer whose storecards appear with some frequency but are increasingly difficult to find in high grades, which only adds to their collectibility.

These tokens were struck in copper, brass, and occasionally white metal or nickel. Each of these metals reacts differently to environmental conditions, which means your preservation strategy must account for the specific composition of each piece. I’ve examined hundreds of these tokens over the years, and the difference between a properly preserved specimen and a poorly stored one can mean the difference between a $50 piece and a $500 piece — or more. That’s not an exaggeration. It’s the reality of the market.

The Toning Question: Natural Patina vs. Active Corrosion

Of all the preservation topics I discuss with collectors, toning is the one that generates the most confusion — and, frankly, the most damage. Let me be very clear about the distinction:

What Is Natural Toning (Patina)?

Natural toning — often called patina on copper and brass pieces — is a thin, stable layer of oxidation that forms slowly over decades or centuries on the surface of a coin or token. On Civil War tokens, this can manifest as:

• Rich chocolate brown — The classic, highly desirable look on copper tokens that serious collectors actively seek out
• Russet or mahogany hues — Warm, multi-toned surfaces with outstanding eye appeal
• Steel-gray or iridescent tones — Often seen on brass or white metal pieces, and absolutely stunning when original
• Subtle rainbow toning — Thin-film interference patterns that develop under specific storage conditions and can dramatically enhance a token’s visual impact

In my experience grading and conserving these pieces, natural toning is almost always protective. It forms a stable barrier that prevents further oxidation. On Civil War tokens, original toning is a significant value enhancer. Collectors and grading services like PCGS and NGC recognize that a naturally toned, uncleaned token is worth substantially more than an artificially brightened one. The luster beneath that patina tells the story of the original strike — and once it’s gone, it’s gone forever.

What Is Active Corrosion?

Active corrosion, by contrast, is the enemy. It is ongoing, progressive, and destructive. Signs of active corrosion on Civil War tokens include:

• Bright green or powdery deposits — This is verdigris, and it is actively eating into the metal
• Pitting or roughness — Areas where the surface has begun to degrade
• Flaking or chalky texture — The metal is breaking down at a molecular level
• Uneven, blotchy discoloration — Often caused by exposure to moisture or chemicals

If you spot active corrosion on a Civil War token, do not attempt to clean it yourself. Isolate the piece immediately — more on proper holders below — and consult a professional conservator. I have seen collectors destroy the surface of a rare storecard by trying to “fix” corrosion with household cleaners. The damage is irreversible, and the numismatic value evaporates instantly.

PVC Damage: The Silent Killer of Your Collection

If there is one thing that makes me shudder more than anything else when I examine a collector’s holdings, it is the sight of coins and tokens stored in PVC-containing flips and holders. PVC — polyvinyl chloride — is a type of plastic that was once the standard in coin storage. It is now recognized as one of the most destructive materials you can put near a numismatic item.

How PVC Damages Coins and Tokens

PVC contains plasticizers — chemicals added to make the material flexible. Over time, especially in warm or humid environments, these plasticizers break down and release hydrochloric acid. This acid reacts with the metal surface of coins and tokens, creating a distinctive:

• Greenish, sticky residue — Often mistaken for verdigris but chemically different, and far more insidious
• Hazy or cloudy film — A surface alteration that cannot be reversed without aggressive — and damaging — intervention
• Progressive surface erosion — In severe cases, the design details of the token can be permanently obscured, destroying both eye appeal and collectibility

I cannot stress this enough: PVC damage is cumulative and irreversible. A token stored in a PVC flip for five years may show only slight hazing. After twenty years, the damage can be catastrophic. I have examined Civil War tokens that were practically unrecognizable after decades of PVC exposure — pieces that could have been worth hundreds of dollars reduced to virtually nothing.

How to Identify PVC Holders

Many older collectors’ supplies contain PVC. Here is how to identify them:

• Flexibility — PVC flips are soft and very floppy. Non-PVC (archival) flips are stiffer and crisper to the touch.
• Smell — PVC has a distinctive chemical odor, especially when new. Archival Mylar flips are completely odorless.
• Labeling — Look for terms like “archival,” “Mylar,” “polyethylene,” or “polypropylene.” If the packaging does not specify, assume it contains PVC.
• Age — Any coin holder purchased before the mid-1990s is suspect. PVC was the industry standard before that era.

Proper Holders: Building an Archival Storage System

Now that we know what to avoid, let’s talk about what you should be using. Building a proper archival storage system for your Civil War tokens is not expensive, and it is the single best investment you can make in protecting your collection’s long-term value.

Individual Token Storage

For individual Civil War tokens, I recommend the following hierarchy of storage options, from best to acceptable:

1. PCGS or NGC slabs (professional grading) — If your tokens are professionally graded, they are already in archival-quality, sonically sealed holders. This is the gold standard for both preservation and marketability, and it immediately establishes provenance and grade for future buyers.
2. Interlocking hard plastic capsules (e.g., Air-Tite, Capital Plastics) — These rigid, two-piece capsules provide excellent physical protection and are made from inert, archival materials. Available in a range of diameters to fit different token sizes.
3. Mylar (polyethylene terephthalate) flips — Specifically, Archival Methods or Lighthouse brand Mylar flips. These are stiff, clear, and completely inert. They provide good protection for tokens that are not yet slabbed.
4. Polyethylene or polypropylene flips — Acceptable alternatives to Mylar. Ensure they are explicitly labeled as archival and PVC-free.

Never use: PVC flips, paper envelopes (acid can transfer to the metal), rubber bands (sulfur causes toning and corrosion), or wooden drawers (off-gassing from wood finishes can damage surfaces over time).

Bulk Storage and Organization

For larger collections, consider these additional measures:

• Archival-quality coin boxes — Cardboard boxes with acid-free dividers, specifically designed for numismatic storage
• Slab storage boxes — If your collection is primarily slabbed, purpose-built boxes that hold PCGS or NGC slabs upright and organized
• Desiccant packets — Including silica gel packets in your storage area to control humidity (aim for 30–40% relative humidity)

To Clean or Not to Clean: The Cardinal Rule of Numismatic Preservation

This is the section I wish every collector would read and internalize before they ever touch a cleaning product near a coin or token. The cardinal rule of numismatic conservation is simple:

DO NOT CLEAN YOUR COINS OR TOKENS.

I know this sounds absolutist. I know that every year, new products come on the market claiming to “safely” restore the brilliance of old coins. I know that the temptation to make a dull, dark token look bright and shiny is powerful. But I have spent my career undoing the damage caused by well-intentioned cleaning, and I am telling you: the risk far, far outweighs any perceived benefit.

Why Cleaning Destroys Value

Here is what cleaning actually does to a Civil War token:

• Removes original patina — The natural toning that took decades or centuries to form is stripped away in seconds. This patina is part of the token’s history and authenticity, and it directly contributes to eye appeal.
• Creates artificial surfaces — Cleaned coins and tokens develop a “washed out” or “unnatural” appearance that is immediately recognizable to experienced graders and collectors.
• Causes micro-scratching — Even gentle rubbing with a cloth creates microscopic scratches that dull the surface and reduce the grade.
• Triggers active corrosion — Removing the stable oxide layer exposes fresh metal to the environment, potentially restarting the oxidation process and accelerating deterioration.

On the grading scale, a cleaned token will typically be marked as “Cleaned,” “Damaged,” or “Altered Surface” by PCGS or NGC. This designation can reduce the value by 50% to 90% or more compared to an equivalent uncleaned specimen. I have seen tokens worth $1,000 or more drop to $100 or less after cleaning. That’s not a hypothetical — it’s something I’ve watched happen, and it never stops being painful.

The Only Exception: Professional Conservation

There is exactly one scenario in which surface intervention is appropriate: professional conservation by a trained numismatic conservator. Organizations like the American Numismatic Association (ANA) can provide referrals to qualified conservators who use controlled, reversible techniques to stabilize active corrosion or remove harmful contaminants.

Professional conservation is not cleaning in the traditional sense. It is a carefully controlled process designed to stabilize a coin or token, not to make it look prettier. A qualified conservator will never promise to “improve” the appearance of your piece. They will only aim to halt ongoing deterioration — and that distinction matters enormously for preserving numismatic value.

Oxidation and Environmental Controls

Beyond toning and corrosion, there are broader environmental factors that affect the long-term preservation of Civil War tokens. Understanding and controlling these factors is essential for any serious collector who wants to maintain mint condition surfaces.

Humidity

Moisture is the primary driver of oxidation and corrosion. Aim to store your collection in an environment with 30–40% relative humidity. Higher humidity accelerates the formation of verdigris on copper and brass tokens. Extremely low humidity (below 20%) is generally less harmful but can cause issues with organic storage materials.

Practical tips:

• Use a hygrometer in your storage area to monitor humidity levels consistently
• Include silica gel desiccant packets in your storage containers, replacing or recharging them regularly
• Avoid storing collections in basements, attics, or garages where humidity fluctuates dramatically

Temperature

Stable, moderate temperature is ideal. Avoid:

• Extreme heat (above 85°F/30°C) — Accelerates chemical reactions, including PVC off-gassing
• Extreme cold — Can cause condensation when items are moved to warmer environments
• Rapid temperature fluctuations — Causes condensation, which is devastating to metal surfaces

Air Quality and Pollutants

Environmental pollutants can also damage token surfaces over time:

• Sulfur compounds — Found in rubber, wool, and some papers. Cause darkening and tarnish that can obscure original luster.
• Chlorides — Found in salt air (coastal environments) and some cleaning products. Cause pitting and corrosion that permanently damages the strike details.
• Acidic vapors — Off-gassed from wood, adhesives, and certain plastics. Cause surface etching that diminishes eye appeal.

Store your tokens in a clean, climate-controlled interior room of your home, away from kitchens, bathrooms, and workshops. This single step can make an enormous difference over the years.

Handling Best Practices

Even with perfect storage, improper handling can damage your tokens. Follow these guidelines every time you examine or move a piece:

1. Always handle tokens over a soft surface — A padded tray or cloth-covered table. If you drop a token onto a hard floor, the impact can cause rim dings, scratches, or even cracks that permanently affect the grade.
2. Hold tokens by the edges only — Never touch the obverse or reverse surfaces. The oils and moisture from your skin can leave fingerprints that become etched into the metal over time.
3. Consider wearing cotton or nitrile gloves — While gloves can reduce dexterity (and increase the risk of dropping), they provide an extra layer of protection. If you choose not to wear gloves, wash and dry your hands thoroughly before handling.
4. Never slide tokens across surfaces — Place them down gently. Sliding causes hairline scratches that accumulate over time and degrade the surface.
5. Use both hands for larger or heavier tokens — Some Civil War tokens and storecards are substantial pieces. Treat them with the same care you would give to a fine antique.

Insurance and Documentation

Finally, no preservation strategy is complete without proper documentation and insurance. For valuable Civil War tokens — especially rare storecards from issuers like Alfred S. Robinson, Edward Cogan, M.L. Marshall, and John K. Curtis — I strongly recommend:

• Professional photographs — High-resolution images of both the obverse and reverse of each token, stored digitally in multiple locations. These are invaluable for insurance claims and for establishing provenance.
• Detailed inventory records — Including purchase price, date, seller, grade, and any historical provenance information that enhances the piece’s story and collectibility.
• Professional grading — Having your most valuable tokens slabbed by PCGS or NGC provides both protection and a recognized grade that facilitates insurance claims and future sales.
• Scheduled personal property insurance — Standard homeowner’s policies typically have low limits for collectibles. A separate rider or specialized collectibles policy (through companies like American Collectors Insurance or Numismatic Guaranty Company’s insurance program) is essential for collections of significant value.

Conclusion: Preserving History for the Next Generation

The Civil War tokens issued by Alfred S. Robinson, Edward Cogan, M.L. Marshall, and John K. Curtis are more than collectible curiosities. They are tangible artifacts of a nation in crisis — small copper discs that circulated through the hands of Americans during the most turbulent period in the country’s history. The fact that these four merchants advertised together in the New York Tribune on April 8, 1861, just days before the first shots at Fort Sumter, adds a layer of historical resonance that no amount of money can manufacture.

As collectors and custodians of these pieces, we have a responsibility to preserve them properly. That means:

• Storing them in archival-quality, PVC-free holders
• Maintaining stable environmental conditions (30–40% humidity, moderate temperature)
• Never cleaning them under any circumstances
• Handling them with care and respect
• Documenting and insuring your collection appropriately

The hobby of exonumia collecting — as that forum poster so eloquently noted — is one of endless research and discovery. Every token has a story. Every merchant advertisement, every die variety, every connection between collectors and dealers like JNT Levick and Alfred S. Robinson adds another chapter to the rich narrative of American numismatic history. Finding a rare variety in exceptional condition is one of the great thrills of this pursuit.

But those stories can only continue to be told if we take the steps necessary to ensure these pieces survive. Do not be the collector who ruins a piece through ignorance or carelessness. Be the collector who preserves it — who passes it on to the next generation in better condition than they found it. That is the true mark of a responsible numismatist, and it is the standard to which we should all aspire.

If you are ever in doubt about the proper care of a Civil War token or any numismatic item, consult a professional. The American Numismatic Association, your local coin club, and professional grading services are all excellent resources. The cost of expert advice is always less than the cost of a mistake — and in this hobby, mistakes can be permanent.

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