Any good ways to clean unidentifiable colonial coppers?
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Thread: Any good ways to clean unidentifiable colonial coppers?

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  1. #1
    us
    Oct 2019
    MA
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    All Types Of Treasure Hunting

    Any good ways to clean unidentifiable colonial coppers?

    Hey all,
    I found a few coppers that have become super corroded from acidic New England soils. Have y'all had any success at cleaning/identifying toasted coppers with no detail left on em? I'm thinkin of soaking the coppers in hydrogen peroxide for a day, but I'm not sure if it'll do much.

  2. #2
    us
    Member of the 1500's club

    Jul 2016
    Rocky Point, NY
    Whites Spectra V3I
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    Hello, keep in mind, whatever you do to the coin, you can never undo. If you decide to clean it, be prepared to wish you hadn't. All this said, I think Andres pencils are the best way to go. Electrolysis doesn't work on coppers. Post a picture of what you found. Id like to see it.
    1500's Club: 1540's SANTO DOMINGO 4 Maravedis
    http://www.treasurenet.com/forums/wh...-hammered.html

  3. #3
    us
    Oct 2014
    florida
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    Although I don't find coppers here in Florida, I have noticed that most who do find worn out ones tend to rely on what little info they can see from shining a flashlight across the surface of the coin at a sharp close angle, then take note of bust contours and what letters may be discernible. There may be one little hint that will identify the copper.
    smallfoot likes this.

  4. #4
    us
    Jun 2012
    NJ
    Whites
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    Beach and Shallow Water Hunting

    Any good ways to clean unidentifiable colonial coppers?

    Also try using a couple drops of heavy cream or half and half on an oil less toasted copper. Let sit for a bit as the heavy cream separates.
    You may start to see some details without damage to the coin.
    Donít put too much cream on the coin, just enough to cover without overflowing or spilling over the edge.
    Last edited by flyadive; Dec 01, 2019 at 01:30 PM.
    sjvalleyhunter likes this.

  5. #5
    us
    Oct 2019
    MA
    25
    33 times
    All Types Of Treasure Hunting
    Thanks for the replies so far!
    Here’s one copper: Click image for larger version. 

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    Click image for larger version. 

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    Sometimes I think I can see the outline of a bust on one side, but I might just be imagining things The other side is completely wiped. I figure there’s nothing to loose experimenting on it since its pretty much toast right now
    powrsurg likes this.

  6. #6

    Apr 2016
    South Western PA
    ACE 250 with DD coil Equinox 600
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    Metal Detecting
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    Sometimes the most details a toasty copper will ever reveal is when it is first wiped of dirt and the temporary verdigris carries the lost detail. Yours is most likely a colonial KG coin. Sometimes you can smooth off the crust (with scotch brite pad) and recover a faint raised bust facing left or right. Sometimes this method just takes it from toasty to ugly.

  7. #7
    Charter Member
    us
    Nov 2012
    Maryland
    XP Deus, Tesoro Cibola, Full sized shovel and a backhoe
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    What I have learned in the last few years is removing the dirt can be the worst thing you can do to a toasted copper. Fluids also tend to kill them. Use toothpics or the Andre's pencils. Go slow.

  8. #8
    Charter Member
    us
    Apr 2012
    West Coast
    AT Pro, AT Max, AT Gold - Tesoro Euro Sabre - Tesoro Bandido II uMax - Troy X2 - Tesoro Stingray - Mojave - Fisher 1280X- Fisher 1235X - and many more.
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    Quote Originally Posted by smokeythecat View Post
    What I have learned in the last few years is removing the dirt can be the worst thing you can do to a toasted copper. Fluids also tend to kill them. Use toothpics or the Andre's pencils. Go slow.
    Guys,..... I have a question.

    On a clapped out coin that you,...well actually, want clean.
    A gentle slow clean that affects the parent material in no way what so ever.

    Has anyone used tumbling or vibratory finishing with maybe walnut shells, no rouge.
    Or something even more gentle,..... wood chips, it would take some trying.

    The time you let it run in the machine is the one thing.
    The other is "wet or dry",.....
    The next other is what media.

    Or, use one media for 5 hours,.....
    Have a look at the piece, maybe let it run some more,....
    Maybe change out the media for an even finer / gentler media.

    And let that run for whatever,....

    After you done a few, you would get a feel for "more time", "add water", "change media".

    You have to clean the media every so often.
    It gets dirty, the water, if you are using water, will turn black.

    Anyone ever gave gentle tumbling / vibratory finishing a try for cleaning up these kinda coins?

  9. #9
    us
    Mar 2019
    Half way Between Perry and Owosso Michigan
    Fisher 1210 , Tesoro Golden Sabre , CZ5 , Equinox 800
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    All Types Of Treasure Hunting
    You never never tumble coins unless you plan on turning them into a bank or the machine .

 

 

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