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Identifying Cleaned Coins - Recommended Reading?

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Wideglide's Avatar
United States
646 Posts
 Posted 04/10/2023  9:30 pm Show Profile   Bookmark this topic Add Wideglide to your friends list Get a Link to this Message Number of Subscribers
My grading skills have improved quite a bit over the last couple years, I think. The next skill I really need to improve upon, is distinguishing coins that have been cleaned. After all, there can be a much bigger value difference between a cleaned coin vs uncleaned, than perhaps between a VF and EF coin. Does anyone have any recommendations (books, reading materials or YouTube) on identifying cleaned coins? Thanks for any help and suggestions!
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HondoB's Avatar
United States
24939 Posts
 Posted 04/10/2023  9:45 pm  Show Profile   Bookmark this reply Add HondoB to your friends list Get a Link to this Reply
Wide, I've certainly paid my tuition at the School of Hard Knocks for an education in Cleaned Coins. It takes experience = time to learn the characteristic appearance of a "cleaned" coin. There are definite indicators for copper and silver, especially from the 19th century. A video would provide general clues and diagnostics, but I don't think there will ever be a test better than the Mark 1 Eyeball.
If someone can provide a link, I also would be interested in it.
Inordinately fascinated by bits of metal with strange markings and figures
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sel_69l's Avatar
Australia
21786 Posts
 Posted 04/11/2023  02:30 am  Show Profile   Bookmark this reply Add sel_69l to your friends list Get a Link to this Reply
A large number of coins in my collection have been cleaned.
- How come?
My first numismatic love is for ancient coins.
Just about all ancient coins have been recovered from ground burial at some time or other, and in almost every case, they need cleaning,

As a follow on, I don't mind collecting modern coins that have been cleaned
- provided that a good job has been done, and
- provided the price is right, consistent with the market for cleaned modern coins.

I agree that it foolish in most cases to clean any modern coin,
because a very large value reduction happens when they have been cleaned.
I sometimes take advantage of this, if such a coin is marked down below it's true cleaned value.
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United States
2280 Posts
 Posted 04/11/2023  02:41 am  Show Profile   Bookmark this reply Add NumismaticsFTW to your friends list Get a Link to this Reply
In theory you can learn anything by reading.

You can educate yourself on some obvious signs of cleaning by pictures.

What's best is looking at tons of coins in hand.

I suggest finding a mentor and friends willing to help.

Your Coin Club or LCS is perfect.

Befriend the dealers and they will teach you and allow you to look at their inventory for practice.
You realize when you know how to think, it empowers you far beyond those who know only what to think.

-Neil deGrasse Tyson
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sel_69l's Avatar
Australia
21786 Posts
 Posted 04/11/2023  08:36 am  Show Profile   Bookmark this reply Add sel_69l to your friends list Get a Link to this Reply
NumismaticsFTW has said it right.
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jacrispies's Avatar
United States
3848 Posts
 Posted 04/11/2023  10:23 am  Show Profile   Bookmark this reply Add jacrispies to your friends list Get a Link to this Reply
I was mostly self taught. You just need to look at as many coins as you can per day, either through photos or in hand.

Try going through every coin in your collection and studying them with a loupe, finding any hairlines, strange color patterns, or lack of original toning that may hint that it was cleaned.
Suffering from bust half fever.
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