Paraloid B72 To Stabilize Lincoln Cents With Plating Issues?

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Author	Replies: 5 / Views: 967
SamCoin Pillar of the Community United States 3237 Posts	Posted 06/16/2023 10:48 am 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. Report this Post to the Staff

Spence Moderator United States 34396 Posts	Posted 06/16/2023 10:52 am @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." -----Ghanaian proverb "The danger we all now face is distinguishing between what is authentic and what is performed." -----King Adz Report this Post to the Staff
SamCoin Pillar of the Community United States 3237 Posts	Posted 06/16/2023 11:05 am @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. Report this Post to the Staff
Spence Moderator United States 34396 Posts	Posted 06/16/2023 1:52 pm 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 Report this Post to the Staff
sel_69l Bedrock of the Community Australia 21786 Posts	Posted 06/16/2023 7:50 pm 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? Report this Post to the Staff
SamCoin Pillar of the Community United States 3237 Posts	Posted 06/28/2023 12:57 am @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. Report this Post to the Staff
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