It’s crucial to understand that cleaning a coin can significantly reduce its value, especially if it’s a collectible or antique item. Appraisers and coin experts advise against cleaning such coins, as it can damage the patina (natural layer formed over time) and cause scratches or marks that are visible to a skilled appraiser.
However, if you’re dealing with low-value coins or those heavily soiled with dirt and grime, a gentle cleaning might be considered to improve their appearance, though it’s still best to proceed with caution.
- Rinse with Distilled Water: Hold the coin by its edges under a gentle stream of lukewarm distilled water to remove loose dirt and grime. [As stated by wikiHow] , if you live in a city, tap water can contain chlorine that might discolor the coin, so distilled water is preferred. Gently rub the coin with your fingers to help loosen dirt, then pat it dry with a soft, lint-free cloth.
- Soapy Water Soak: If the distilled water alone isn’t enough, mix a small amount of mild hand soap (not dish detergent) into a bowl of tepid distilled water. Soak the coins one at a time for a few minutes to prevent them from clinking together. Gently rub the coins with your fingers while submerged, then rinse thoroughly with distilled water and pat dry with a soft cloth.
- Baking Soda Paste: For more stubborn dirt or tarnish, combine baking soda with a small amount of water to form a paste. Gently apply the paste to the coin using your fingers or a soft-bristled toothbrush, avoiding harsh scrubbing. Rinse with distilled water and pat dry.
- Vinegar Soak (for Modern Copper Coins): Modern copper coins can be cleaned with vinegar, which can make them very bright. Place the coins in a bowl and cover them with white vinegar, letting them soak for at least 30 minutes but no longer than overnight. Rinse the coins with water and dry with a soft cloth.
- Never use abrasive materials such as steel wool, wire brushes, or harsh chemicals like bleach or chlorine-based cleaners, as these can permanently damage the coin’s surface and reduce its value.
- Avoid polishing coins, as this can remove the patina and reduce the coin’s value, according to the [U.S. Mint].
- Always handle coins by their edges to prevent the natural oils and acids on your hands from damaging the surface. It’s recommended to wear lint-free cotton gloves when handling valuable coins.
- Proper storage is essential for maintaining the condition and value of your coins. Store them in a cool, dry place with low humidity, and use acid-free and PVC-free holders to prevent damage from environmental factors.
If you have valuable or antique coins, or are unsure about the best cleaning method for your specific coins, it’s best to consult a professional coin conservator. These professionals have the expertise and equipment to clean coins safely without compromising their value. You can find reputable coin dealers or grading services in your area who can provide expert advice or professional cleaning services, according to [Sydmor’s Jewelry and Loan].
Does Dawn dish soap clean pennies?
Especially bright copper. If you have to use anything to try and get some gunk.