While it may seem counterintuitive, cleaning a coin can significantly decrease its numismatic value . Collectors typically prefer coins with their natural patina and toning, which develops over time and represents a coin’s unique history.
Here’s how to determine if a coin has been cleaned:
1. Examine for fine, consistent scratches:
- Hold the coin at an angle under a light source.
- Look for tiny, parallel hairline scratches that may not be immediately obvious to the naked eye.
- These scratches are often incuse (recessed) on the surface, similar to lines on sanded wood.
- While some wear and tear is normal from circulation, cleaning scratches tend to be more uniform and directional.
2. Evaluate toning and coloration:
- Compare the coin’s toning to uncleaned coins of the same type and era.
- Cleaning, especially chemical dips, can remove the natural patina or toning a coin should have developed over time.
- Look for a “washed out” or unnatural appearance, particularly if the coin is unusually shiny for its age and wear.
- Uneven toning , with darker areas around the letters and details, can also indicate cleaning, as these areas are harder to clean without damage.
3. Assess the luster:
- Original mint luster has a specific cartwheel pattern that reflects light in a particular way when the coin is tilted.
- Cleaning often removes or alters this luster , making it appear flat or dull.
4. Seek expert opinion:
- If you’re unsure, the most reliable way to determine if a coin has been cleaned is to consult a reputable coin expert or a professional coin grading service.
- They can examine the coin in detail and, if eligible, even offer a grading service that will indicate any signs of cleaning.
Key takeaways:
- Cleaning can significantly decrease a coin’s value, as collectors prefer natural patina.
- Look for fine, consistent scratches, especially with a magnifying glass and proper lighting.
- Compare toning to uncleaned coins; look for a washed-out or unnatural appearance.
- Assess the coin’s luster and how it reflects light.
- When in doubt, consult a coin expert for professional assessment.
How to tell if a coin has been whizzed?
Is because of the devices. So the areas that’s raised. So one of the things that you’ll notice on a coin that’s been whizzed is that the luster.
How do coin dealers clean coins?
Good point! 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 does a clean coin look like?
See the luster just rolling off that. Thing. So look at them side by side. Here.