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Paraloid B72 To Stabilize Lincoln Cents With Plating Issues?

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SamCoin's Avatar
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 Posted 06/16/2023  10:48 am Show Profile   Bookmark this topic Add SamCoin to your friends list Get a Link to this Message Number of Subscribers
For those not familiar with paraloid b72, it's a non-reactive polymer resin used primarily in paleontological preparation to consolidate and protect specimens to prevent them from crumbling or losing material. It can also be mixed in higher concentrations and applied as a surface coat, which is why I'm wondering if it might be useful for protecting Lincoln cents with plating issues to prevent zinc rot. The great thing about b72 is that it's typically mixed in acetone solutions and is completely reversible in an acetone bath. Wondering if people have any experience or insight into why b72 might or might not be a useful tool for stabilizing problem Lincoln cents.
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Spence's Avatar
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 Posted 06/16/2023  10:52 am  Show Profile   Bookmark this reply Add Spence to your friends list Get a Link to this Reply
@sam, here is a link to an old thread which may be of some interest.

http://goccf.com/t/404457


Here is one pertinent passage from @west:

Quote:
I've researched a little into some of the more often used chemical compounds at museums. Stuff like Agateen,
Paraloid B-72, and Paraloid B-48N (these are generally only found in use with bronze and silver coins), The American Institute for Conservation of Historic & Artistic Works put out a few papers on their testing of these materials. However this is way above the average collectors head for the most part. If interested I have copies of the testing paper and results, shoot me an email if you would like a copy of the PDF. It's in depth and very scientific but not over one's head in depth.
"If you climb a good tree, you get a push."
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SamCoin's Avatar
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 Posted 06/16/2023  11:05 am  Show Profile   Bookmark this reply Add SamCoin to your friends list Get a Link to this Reply
@Spence thanks, that seems like a good jumping off point. Is the user's full name just "west" or is that part of something longer? I'll send them a message and ask about what they've found.
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Spence's Avatar
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 Posted 06/16/2023  1:52 pm  Show Profile   Bookmark this reply Add Spence to your friends list Get a Link to this Reply
Yes sorry about using shorthand when referring to their username. You should reach out to @westcoin.
"If you climb a good tree, you get a push."
-----Ghanaian proverb

"The danger we all now face is distinguishing between what is authentic and what is performed."
-----King Adz
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sel_69l's Avatar
Australia
21786 Posts
 Posted 06/16/2023  7:50 pm  Show Profile   Bookmark this reply Add sel_69l to your friends list Get a Link to this Reply
I have experimented with acrylic spray coating of high MS ''64 Kennedys, to protect the blast white luster from patination

.Acrylic spray coatings also easily removed with an acetone bath.

I was not happy with the result, because the acrylic coating could come off in tiny flakes, and thus make way for differential patination in the unprotected areas.


My question is this:
Do the paraloid applications work on blast white high MS silver coins without flaking off?
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SamCoin's Avatar
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 Posted 06/28/2023  12:57 am  Show Profile   Bookmark this reply Add SamCoin to your friends list Get a Link to this Reply
@sel I would expect paraloid to be pretty stable as a coating. It's used in fossil prep because it doesn't alter with age and is inert, so I wouldn't expect it to flake. That said, I'm not a chemist.
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