Impaired Proof Preservation - Coin Community Forum

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Author	Replies: 9 / Views: 429
Vector Ze Valued Member United States 450 Posts	Posted 04/04/2026 3:22 pm Over the years, I've accumulated a number of impaired proofs from 90% silver purchases and coin roll hunting. So, both Ag and Cu-Ni proofs. Suggestions for preservation? Will acetone help remove fingerprints and light grunge without damaging the coins' surfaces further? These are not toned coins, but some of them have light surface contaminants. How long can they soak, or is duration not a concern? TIA Report this Post to the Staff

BadThad Bedrock of the Community United States 19930 Posts	Posted 04/04/2026 3:45 pm Proofs are extremely sensitive and easily ruined. Always start with the Polarity Ladder. Lincoln Cent Lover! VERDI-CARE™ INVENTOR https://verdi.care/ Report this Post to the Staff
Dearborn Moderator United States 94586 Posts	Posted 04/04/2026 4:01 pm Usually, once a fingerprint has set in, it is a permanent feature as the oils will etch the surface. In my experience, only very fresh prints can be safely removed. Collecting since 1972. Learning from then on "Tell me and I forget. Teach me and I remember. Involve me and I learn." - Benjamin Franklin 7070 type set coin count: 51/76 Uncirculated American Silver Eagles My American Silver Eagle Proof Collection Sacagawea Dollars Innovation Dollars Eisenhower-Dollars Kennedy-Half Dollars Washington-Quarters Roosevelt-Dimes Buffalo-Nickels 1938-2005 Jefferson-Nickels Lincoln-Cents Report this Post to the Staff
Marv65 Bedrock of the Community United States 10470 Posts	Posted 04/04/2026 7:18 pm Quote: Will acetone help remove fingerprints and light grunge without damaging the coins' surfaces further? If the fingerprint is new then a strong "Maybe" - if it is older then the oils from the fingerprint have already eaten into the coin's surface and there is now way back from that! And cleaning a proof is always a challenge. IF successful - the fields will eventually cloud back up...........so it's really not recommended. Report this Post to the Staff
Vector Ze Valued Member United States 450 Posts	Posted 04/04/2026 10:05 pm I'm convinced. Impaired Proofs are what they are. Yeah, I knew that. I don't guess there's much to improve them, just be happy for the unexpected finds. They're cool in their own way. Thanks, y'all. Report this Post to the Staff
Dearborn Moderator United States 94586 Posts	Posted 04/05/2026 9:26 pm you can always start an 'Impaired Proof' collection Collecting since 1972. Learning from then on "Tell me and I forget. Teach me and I remember. Involve me and I learn." - Benjamin Franklin 7070 type set coin count: 51/76 Uncirculated American Silver Eagles My American Silver Eagle Proof Collection Sacagawea Dollars Innovation Dollars Eisenhower-Dollars Kennedy-Half Dollars Washington-Quarters Roosevelt-Dimes Buffalo-Nickels 1938-2005 Jefferson-Nickels Lincoln-Cents Report this Post to the Staff
jbuck Moderator United States 187446 Posts	Posted 04/06/2026 11:59 am Quote: you can always start an 'Impaired Proof' collection Coin Collector Since 1978 Avatar Old Avatar 7070 Eisenhower Australia Canada World CCF Members on eBay CCF eBay Search Engine Report this Post to the Staff
Topology New Member United States 25 Posts	Posted 04/11/2026 9:45 pm I throw my 'impaired proofs' into coin flips and store them separately from the rest. Report this Post to the Staff
Marv65 Bedrock of the Community United States 10470 Posts	Posted 04/11/2026 10:34 pm Quote: you can always start an 'Impaired Proof' collection I think he just did - Report this Post to the Staff
jbuck Moderator United States 187446 Posts	Posted 04/13/2026 11:38 am Quote: I think he just did - Coin Collector Since 1978 Avatar Old Avatar 7070 Eisenhower Australia Canada World CCF Members on eBay CCF eBay Search Engine Report this Post to the Staff
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