Generally, cleaning a collectible coin will devalue it significantly.
- Damage to the surface: Cleaning, especially with abrasive methods like scrubbing or using harsh chemicals, can leave scratches (often microscopic and called “hairlines”) on the coin’s surface. This damages the coin’s original finish and luster, which are key factors in determining its grade and value.
- Removal of Patina/Toning: Many collectors appreciate the natural patina or toning that develops on coins over time, as it’s considered part of the coin’s history and authenticity. Removing this layer during cleaning can significantly reduce the coin’s appeal and value.
- Reduced Collectibility: Collectors generally prefer coins in their original condition, [according to the Great American Coin Company] . A cleaned coin is often considered “altered” and less desirable, making it harder to sell and potentially fetching a lower price.
- Ancient Coins: In some cases, ancient coins (especially those that have been buried) may require cleaning for identification and preservation, [says APMEX] . However, this should only be done by experienced professionals using specialized conservation methods to avoid damage.
- Professional Conservation: Professional coin conservation services exist that can remove harmful contaminants and stabilize a coin’s surfaces without damaging its original features or reducing its value. Examples include NGC’s Conservation Service and ANACS Conservation Service. These services are distinct from amateur cleaning and should be considered if you have a valuable coin with significant surface issues.
In summary, unless you are dealing with a rare or ancient coin that requires professional conservation, it is generally recommended to avoid cleaning your coins as it can significantly reduce their value.
Should I clean my coins before getting them appraised?
Good point! NO… You should never clean a coin. That takes away from the value. Coins grading companies like NGC and PCGS have a service called conservation, it is like cleaning. They will restore the coin ONLY if it does not damage the coin.