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Cleaning Pennies Specifically  
 

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New Member
Canada
33 Posts
 Posted 01/11/2018  11:47 am Show Profile   Bookmark this topic Add JBU to your friends list Get a Link to this Message
I have two specific questions about cleaning pennies. (I already soaked both groups of pennies in acetone for 10 days with little improvement).

1. In the first case I'm wondering if its possible to remove the green crud on the copper. Must be some kind of chemical reaction. Not sure what its called...

2. In the second case, I'm wondering if its possible to remove this kind of heavy dirt and grime. Any insight would be appreciated. Thanks!

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50550 Posts
 Posted 01/11/2018  11:57 am  Show Profile   Bookmark this reply Add jbuck to your friends list Get a Link to this Reply
For reference, look at Bad Thad's polarity ladder.

It is likely that Verdi-Care will be needed to rescue these. You will have to ask yourself if they are worth the expense (time and money).
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20945 Posts
 Posted 01/11/2018  1:43 pm  Show Profile   Bookmark this reply Add Coinfrog to your friends list Get a Link to this Reply
Good advice on both counts. Even removing the verdigris will likely leave a different sort of discoloration underneath.



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 Posted 01/11/2018  1:48 pm  Show Profile   Check Crazyb0's eBay Listings Bookmark this reply Add Crazyb0 to your friends list Get a Link to this Reply
Once a coin has received staining it is virtually impossible to reclaim it without stripping the surface layer that is damaged away...yep, you read that right. The advice given is quite appropriate, these are common coins worth face value, unless some weird variety, but the expense and effort is wasted. Seek better examples CRH or even purchasing would be more cost effective.



Do I see a "science experiment" in the future?

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01/11/2018 1:50 pm
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 Posted 01/11/2018  2:02 pm  Show Profile   Bookmark this reply Add Finn235 to your friends list Get a Link to this Reply
These are, at best, "science experiment" coins. They never had much or any numismatic value, and all that went out the window when they became like this. If you want to try to treat then for the fun and education of it, VerdiCare might help. You could also toss them in some vinegar and see what happens, or melt them into a big blob of metal, then cast that metal into a HUGE mold designed after a penny, that you engraved yourself.
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 Posted 01/11/2018  2:30 pm  Show Profile   Bookmark this reply Add jbuck to your friends list Get a Link to this Reply
Of course, if anyone obtains value in doing experiments, then by all means do it.
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 Posted 01/11/2018  4:36 pm  Show Profile   Bookmark this reply Add T-BOP to your friends list Get a Link to this Reply
I'm afraid your goose is cooked . most of those small cents have a corrosion problem . Verdi-Care will not remove corrosion .
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 Posted 01/11/2018  6:14 pm  Show Profile   Bookmark this reply Add moxking to your friends list Get a Link to this Reply
They are dead. Do not resuscitate.
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 Posted 01/11/2018  6:37 pm  Show Profile   Bookmark this reply Add nickelsearcher to your friends list Get a Link to this Reply


These are corroded beyond any reasonable hope of restoring numismatic value ... which was minimal to begin with.

Politely suggest you move on ... spend them all.
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Too many hobbies .... too much work .... not enough time.
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 Posted 01/11/2018  6:53 pm  Show Profile   Bookmark this reply Add Coinfrog to your friends list Get a Link to this Reply
Yep.
"The value of something is what you can sell it for the same day you bought it."

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Canada
33 Posts
 Posted 01/12/2018  1:31 pm  Show Profile   Bookmark this reply Add JBU to your friends list Get a Link to this Reply
Will this green corrosion spread to other good quality coins if they are stacked together in a roll?
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 Posted 01/12/2018  4:08 pm  Show Profile   Bookmark this reply Add just carl to your friends list Get a Link to this Reply
IF your not worried about their value and since not worth a lot of money, why not just spend some time with soap, water, tooth type brush. Just remember that regardless of if you git all that stuff off, there will be damaged areas beyond repair. Yes, they may look a bit better but then only slightly. Also, try some baking soda and water paste with a toothbrush. If all that fails, go to auto parts store and buy some H2SO4 used in car batteries. It will melt almost all of the Copper and leave you with some really nice looking Blue Crystals.
just carl
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 Posted 01/13/2018  4:31 pm  Show Profile   Bookmark this reply Add BadThad to your friends list Get a Link to this Reply
Most of these have terminal stage verdigris which cannot be removed without destroying the coins worse than they already are.

Keep them away from your non-corroded coins as verdigris can spread via contact. Here's an example I found in a tightly sealed roll:






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14598 Posts
 Posted 01/13/2018  4:33 pm  Show Profile   Bookmark this reply Add BadThad to your friends list Get a Link to this Reply

Quote:
Verdi-Care will not remove corrosion .


WRONG!
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Canada
33 Posts
 Posted 01/15/2018  12:07 pm  Show Profile   Bookmark this reply Add JBU to your friends list Get a Link to this Reply
I put some of my pennies in vinegar and the verdigris went away very quickly, within moments it faded! Good to know that verdigris can spread. Thanks for the pics.
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 Posted 01/15/2018  5:15 pm  Show Profile   Bookmark this reply Add BadThad to your friends list Get a Link to this Reply
Yes, any acid will remove verdigris. However, it also attacks the metal leaving a dull and lifeless coin.
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