Proper care and handling of coins are essential for preserving their condition and value. Even minor mishandling can lead to damage that diminishes a coin's appeal to collectors. Here are some guidelines to help you maintain your coin collection in pristine condition.
Handling Coins
It's best to avoid touching coins directly. Even with thoroughly washed hands, natural oils and minute debris can transfer to the coin's surface, potentially causing corrosion or staining over time. Always wear soft cotton gloves if handling is necessary and hold the coin by its edges between your thumb and forefinger. This minimises contact with the coin's face and reduces the risk of fingerprints or other contaminants. Additionally, handle coins over a soft cloth or pad to cushion them in case of accidental drops.
Cleaning Coins
Generally, it's advisable not to clean coins. Over time, coins undergo a natural process called 'toning,' where oxygen or sulphur reacts with the metal, leading to a change in colour. This toning is often considered part of the coin's charm and can enhance its value. Cleaning can remove this natural patina and may introduce tiny scratches, significantly reducing the coin's worth. If you're concerned about a coin's condition, it's best to consult a professional coin dealer or conservator for advice.
Storing Your Collection
Proper storage is crucial for preserving your coins. For proof or uncirculated coins, please keep them in their original protective folders or capsules to safeguard against environmental factors and physical damage. Consider using coin holders or albums designed for coin storage for loose coins. These not only protect the coins but also help organise your collection. Ensure that storage materials are made of inert substances to prevent chemical reactions with the coins.
When storing your coin collection, it's crucial to avoid materials containing polyvinyl chloride (PVC). PVC is often used in soft, flexible coin holders and flips. Over time, PVC can degrade, releasing acidic compounds that react with the metal surfaces of coins. This reaction leads to damage characterised by greenish, milky, or gray streaks or haze on the coin's surface, commonly called "PVC damage."
Copper coins are particularly susceptible to PVC damage, followed by silver, gold, and platinum coins. The severity of the damage can range from minor discolouration to significant surface corrosion, which can significantly diminish a coin's aesthetic appeal and market value.
Opt for storage solutions made from inert, non-PVC materials to prevent PVC-related deterioration. Products labelled as "archival safe" or "acid-free" are typically suitable choices. By selecting appropriate storage materials, you can preserve the integrity and value of your coin collection for years to come.
For a practical demonstration on identifying PVC in coin storage materials, you might find this video helpful:
How to detect PVC in your coin flips, envelopes and albums:
Additional Tips
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Inspection Tools: Use a high-quality magnifying glass to examine your coins without touching them.
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Lighting: Good lighting is essential for inspecting coins and identifying any issues early.
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Reference Materials: Keep a general coin reference book that includes information on dates, mint marks, major varieties, grading guidelines, and prices.
By following these guidelines, you can ensure that your coin collection remains in excellent condition, retaining both its aesthetic appeal and monetary value for years to come.
References
- United States Mint: "Caring for Your Coin Collection."
- Royal Australian Mint: "Coin Care."
- The Spruce Crafts: "What Is PVC Damage on Coins? How to Remove It."
- CoinWeek: "PVC Damage on World Coins – What It Is & How to Avoid It."
- NGC (Numismatic Guaranty Corporation): "Recognizing Coin Holders That Contain PVC."