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Conserving A Lead Coin

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Author Previous TopicReplies: 4 / Views: 1,168Next Topic  
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Kipster's Avatar
United Kingdom
312 Posts
 Posted 06/17/2025  3:18 pm Show Profile   Bookmark this topic Add Kipster to your friends list Get a Link to this Message Number of Subscribers
Evening,

Has anyone tried to have a Lead coin conserved at all? I'm not sure it would even be possible with this metal type, but I've recently picked up an excessively rare (rated R20) Victorian halfpenny which has what looks like white crystalline corrosion on it, and would like to know if there was anything that could be done with it? It looks like oxidation.

Thanks in advance.
Conserving-A-Lead-Coin

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tdziemia's Avatar
United States
7933 Posts
 Posted 06/18/2025  08:25 am  Show Profile   Bookmark this reply Add tdziemia to your friends list Get a Link to this Reply
I suppose (in principle) it's the same chemistry used in auto batteries (reduction of lead in higher oxidation states back to the pure metal), but I've never specifically heard of it being applied in this situation.
And I sure wouldn't mess around with a very rare coin.
Edited by tdziemia
06/18/2025 9:42 pm
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Portugal
655 Posts
 Posted 06/27/2025  6:10 pm  Show Profile   Bookmark this reply Add jecz79 to your friends list Get a Link to this Reply
As it is white that may be simple lead carbonate. It may have been in a humid environment and exposed to air?

If it is as it looks only superficial corrosion perhaps you can shield it from the air, monitor it and avoid anything aggressive unless it advances? Keep it away from wood.

Reduction is an option but I never tried it. I avoid anything lead and tin because their corrosion is so troublesome. Try to get advice from museum staff.
Edited by jecz79
06/27/2025 6:10 pm
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Conder101's Avatar
United States
17884 Posts
 Posted 07/30/2025  11:24 pm  Show Profile   Bookmark this reply Add Conder101 to your friends list Get a Link to this Reply
Since you are calling it lead I assume it is a counterfeit? They never made Victoriam half pennys for circulation out of lead. (Die trial?) How is the weight? A lead piece would weigh well more than a half penny, a Tin one would weigh less. If it is tin it could be tin pest and that can be a real problem.
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IndianGoldEagle's Avatar
United States
36436 Posts
 Posted 08/24/2025  1:23 pm  Show Profile   Bookmark this reply Add IndianGoldEagle to your friends list Get a Link to this Reply
I've had good luck using Vaseline Petroleum Jelly. Brings back a nice gray color. It works on WWII zinc coins so should do the same for lead. Make sure you wipe all the residue off.
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