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05-22-2009, 12:25 AM
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#1 (permalink)
| | Junior Member
Join Date: May 2009 Location: Valley View TX
Posts: 3
| Corrosion on copper coins
I have some lincoln cents from the early 1900's that would grade VF-XF however they have a considerable amount of blue/blue green corrosion on them. Should, and if so how to remove it is the question.
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05-22-2009, 12:44 AM
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#2 (permalink)
| | Pesimistic Optimist
Join Date: Mar 2009
Posts: 530
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Repeated dips in heated hydrogen peroxide as needed.
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05-22-2009, 01:52 PM
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#3 (permalink)
| | Numismatist
Join Date: Nov 2002 Location: PA
Posts: 24,600
| Quote:
Originally Posted by TomCorona  Repeated dips in heated hydrogen peroxide as needed. | That will do it, but I do believe there are better methods, such as Verdigone.
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05-22-2009, 01:59 PM
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#4 (permalink)
| | The Lincoln-ator
Join Date: Jun 2007 Location: Dry Heat USA
Posts: 6,781
My Mood:  |
interesting, i have never heard of or thought of hydrogen peroxide , i'll try it and if it works, add it to my 'arsenal of knowledge' and include it in my ' destroy the roll ' theory of beginner education talks...........
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05-22-2009, 02:21 PM
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#5 (permalink)
| | Numismatist
Join Date: Nov 2002 Location: PA
Posts: 24,600
| Quote:
Originally Posted by Arizona Jack interesting, i have never heard of or thought of hydrogen peroxide , | It's common Jack, many use it to clean dug coins. Heating accelerates the process.
Sure doesn't mean I would recommend it though.
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05-23-2009, 04:11 AM
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#6 (permalink)
| | Pesimistic Optimist
Join Date: Mar 2009
Posts: 530
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I haven't tried Verdigone but shot glasses filled with peroxide then microwaved for a few seconds works great. Peroxide is about a buck a quart or there about. Cheap, gets rid of the crap and leaves the copper.
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05-23-2009, 08:20 AM
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#7 (permalink)
| | Numismatist
Join Date: Nov 2002 Location: PA
Posts: 24,600
| Quote:
Originally Posted by TomCorona I haven't tried Verdigone but shot glasses filled with peroxide then microwaved for a few seconds works great. Peroxide is about a buck a quart or there about. Cheap, gets rid of the crap and leaves the copper. | Yes, but it also leaves the coin in such a state that an experienced eye can easily see that it has been chemically cleaned. Verdigone does not.
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05-23-2009, 12:12 PM
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#8 (permalink)
| | Junior Member
Join Date: May 2009 Location: Valley View TX
Posts: 3
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What is Verdigone? where can I get it? it seems a side by side test with examination under magnifcation is in order.
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05-23-2009, 12:26 PM
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#9 (permalink)
| | Numismatist
Join Date: Feb 2007 Location: Oklahoma
Posts: 6,814
My Mood:  | Proprietory. Maybe you can convince badthad to tell you, but I doubt it. Read http://www.cointalk.com/forum/t51146/ Quote: |
it seems a side by side test with examination under magnifcation is in order.
| Read http://www.cointalk.com/forum/t48402-2/
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05-23-2009, 07:04 PM
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#10 (permalink)
| | Pesimistic Optimist
Join Date: Mar 2009
Posts: 530
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Yes, but it also leaves the coin in such a state that an experienced eye can easily see that it has been chemically cleaned. Verdigone does not.
I just sold some Lincoln cents to my local coin shop that I pulled out of circulation (after searching boxes and boxes) that were subjected to Peroxide soaking, water rinse and then a half a drop or so of mineral oil between my fingertips. Looked great and I got no mention of cleaning from this gent, and he looked at all of them pretty hard. Verdigone may indeed work better, as I would have to defer to your experience with it, but, Peroxide works great too (at least for circulated coins).
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05-23-2009, 07:49 PM
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#11 (permalink)
| | Coin Hoarder
Join Date: Jul 2008 Location: Out West
Posts: 1,132
My Mood:  |
I have tried peroxide and it worked pretty nice actually. If a coin has blue/green corrosion then getting it off it priority. The coin will look better no matter what if you get it off. I agree with Tom on this one. I have never heated peroxide and will try. I have a few wheats and IHC with lots of corrosion and I will try. Thanks for the idea Tom.
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05-24-2009, 03:37 AM
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#12 (permalink)
| | Pesimistic Optimist
Join Date: Mar 2009
Posts: 530
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Welcome Boss! Heated or non heated works, just takes longer not heated, as was stated.  | |
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05-24-2009, 09:04 AM
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#13 (permalink)
| | Numismatist
Join Date: Nov 2002 Location: PA
Posts: 24,600
| Quote:
Originally Posted by TomCorona
I just sold some Lincoln cents to my local coin shop that I pulled out of circulation (after searching boxes and boxes) that were subjected to Peroxide soaking, water rinse and then a half a drop or so of mineral oil between my fingertips. Looked great and I got no mention of cleaning from this gent, and he looked at all of them pretty hard. | With respect Tom - more than quite a few coin dealers really don't know squat about coins.
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05-24-2009, 05:28 PM
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#14 (permalink)
| | Pesimistic Optimist
Join Date: Mar 2009
Posts: 530
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With respect Tom - more than quite a few coin dealers really don't know squat about coins.
Understood Sir. I appreciate the input and take it graciously knowing that you have the experience to back you up.  I do wish I could convince you to be a little more generally accepting of (at least) this particular method, but I know where you're coming from. Good day.
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05-24-2009, 06:03 PM
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#15 (permalink)
| | Coin Hoarder
Join Date: Jul 2008 Location: Out West
Posts: 1,132
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I think we need a "Jim style" experiment with heated peroxide. I have a VF 1923 S copper that was sitting in Verdigone for a long time with green corrosion/verdigris. Sat for several weeks with 2-3 changes in of the semidiluted Verdigone (about 30% distilled water with 70% Verdigone). Size of corrosion slowly decreased but is decreasing faster with peroxide. Maybe I will do some before/after experiments on other coins with photos. I would debate that others could tell such was done to a given coin. Coins with corrosion or verdigris are ugly in my opinion and I want that stuff off. My eye only goes to the damage.
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