Generally, it’s best to avoid cleaning collectible or valuable coins, as improper cleaning can significantly decrease their value. However , if you have a coin where value preservation isn’t a primary concern or you have an expert’s approval for a gentle cleaning, these methods can be used to remove loose debris:
- Distilled water soak:
– Place the coin in a bowl of warm distilled water and let it soak overnight.
– In the morning, gently pat the coin dry with a soft, lint-free cloth. Do not rub as this can cause scratches.
- Acetone Soak (for surface contaminants/adhesives):
– Soak the coin in pure acetone (not fingernail polish remover, which contains additional chemicals) in a well-ventilated area.
– Use a glass container , as acetone can react with plastic.
– Rinse with distilled water and pat dry with a soft cloth.
- Consult with an expert: Before attempting any cleaning, especially on valuable coins, it’s always best to consult with a professional coin dealer or numismatist for guidance.
- Avoid Harsh Chemicals: Never use abrasive cleaners, household chemicals like vinegar, baking soda, or acidic substances, as these can permanently damage the coin’s surface and destroy its patina, [according to Pinehurst Coins].
- Natural patina and toning: Many collectors value the natural aging and discoloration (patina or toning) on older coins, so preserving it is crucial for maintaining value.
- Proper Handling: When handling coins, use soft cotton gloves and hold them by the edges to avoid transferring oils and dirt from your skin.
What do coin dealers use to clean coins?
From my experience, The coin is dipped into a dilute acid solution that removes the oxidation from the coin along with a small amount of metal. Overdipped coins result in loss of luster which lowers the coin’s grade and appeal. According to author Thomas E. Hudgeons Jr., this is the safest way commonly found coins are cleaned.
What can clean a coin the best?
Thanks for asking. A soak in warm, soapy water followed by a rinse and air-dry is probably the safest method, and it’ll remove loose dirt and surface grime. A soak in acetone (pure, not nail polish remover) followed by an air-dry will work for more stubborn organic gunk.