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Rare Coin Advice: How Not To Clean?

 
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Author Previous TopicReplies: 6 / Views: 285Next Topic  
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 Posted 07/01/2020  11:29 pm Show Profile   Bookmark this topic Add Nickelbox to your friends list Get a Link to this Message
I've recently acquired an 1892 Italian 50 centimes that is in maybe VF condition in terms of detail, but has some nasty black and green stuff on it. It's 83.5% silver. I'm not sure what the substance is and would like to remove it, but I obviously don't want to do anything that would result in it being considered cleaned. Has anyone seen a coin that looks like this and know if anything can be done to remedy it without devaluing it? Or does it already have environmental damage and nothing will save it?





Any advice would be greatly appreciated.
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 Posted 07/02/2020  12:04 am  Show Profile   Bookmark this reply Add westernsky to your friends list Get a Link to this Reply
Pure acetone soak and then rinse in water would be my first attempt.
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 Posted 07/02/2020  02:14 am  Show Profile   Bookmark this reply Add mtuma3 to your friends list Get a Link to this Reply
Yes, acetone... The pure stuff from the hardware store, not nail polish remover...
Soak it overnight
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 Posted 07/02/2020  05:59 am  Show Profile   Bookmark this reply Add John1 to your friends list Get a Link to this Reply
( I'm no pro, it's just my humble opinion )
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 Posted 07/02/2020  07:50 am  Show Profile   Bookmark this reply Add tdziemia to your friends list Get a Link to this Reply
There is black stuff (organic matter) which might be able to be removed with acetone and not adversely affect the appearance, and there is black stuff (silver sulfide) which is the "natural" toning/tarnishing, and will probably make the coin look cleaned if you try to remove it.
It's hard to tell from the photos which you have more of.

Green can also be some kind of organic residue from vinyl, or can be verdigris, a copper compound.
Edited by tdziemia
07/02/2020 07:52 am
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 Posted 07/02/2020  09:34 am  Show Profile   Bookmark this reply Add Dorado to your friends list Get a Link to this Reply
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