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 Replies: 18 / Views: 10,264 |
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Bedrock of the Community
United States
17884 Posts |
Quote:
The black stuff is either silver oxide or sulfide (or both), and the silver in the black stuff and has been sourced from the coin itself. The last digit of the date in the first picture appears to be a 4, and it has a D mintmark on the obverse so it has to be a coppernickel clad coin. So we have the result of acetic acid reacting with the coppernickel. If I remember correctly copper acetate is water soluable but I'm not sure about nickel acetate. That may be what is on the surfaces. A coin dip may remove it, but it may never look like it did originally. |
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Bedrock of the Community
United States
20753 Posts |
Show? What kind of show are you having where you use coins and Bar-Q-Sauce? If your doing this for taste purposes, be careful since coins are usually not good to eat.  If I were you I'd simply try Acetone. Or just washing them in soap and water. If you really want them to look great, try jewlery cleaners. |
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New Member
 France
4 Posts |
Hi, thanks for your answers. Indeed, it's probably a clad coin. At least, not a real coin, one side is english penny, the other side is half dollar. But why this accident ? Some people told me that if I dip them into barbecue sauce they will look dark-brown. My faked coins english pennies / half dollar looked like this : http://www.casimages.com/i/16062407...712.jpg.htmlAnd I wanted them to look like these : http://www.casimages.com/i/16062407...907.jpg.htmlBut you can see this little experiment didn't turned out as expected. The english penny side hasn't been negatively affected by the barbecue sauce. However, the half dollar side of my two copper/silver coins have now this ugly stuff on them. Not sure what it is. So, silver dip is the best solution ? And for just a couple of seconds ? (P.S. : for your information, if you want to know, the coin in first picture has the date 2014, the second no date on it, but I think it's 2015.) Edited by mh1001
07/04/2016 12:19 pm
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Valued Member
Canada
71 Posts |
I posted in another topic about silver probably going terrible in spaghetti sauce, I guess we can add pulled pork to the list.
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Bedrock of the Community
United States
94367 Posts |
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Bedrock of the Community
United States
94367 Posts |
mh1001 - Whatever gave you the idea to use barbeque sauce, anyway?  to the CCF! |
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New Member
France
4 Posts |
Sorry both of you, but I don't think this kind of comments are going to be helpful. I explained why and how this happened. Otherwise, you may not guess what's method to use to clean the coins. And make them look as they used to be, i.e., without this weird dark stuff.
The story behind this is anecdotic, and is not the finality; what's important is the solution. Thanks.
Coinfrog : "mh1001 - Whatever gave you the idea to use barbeque sauce, anyway?" The answer is in my post which is above yours.
Edited by mh1001
07/04/2016 4:54 pm
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Pillar of the Community
United States
6397 Posts |
I expect the coin surface has been oxidized which is likely not a reversible effect. I doubt acetone would help although if there is dried organic crud the acetone might loosen it. All you can do is try different cleaning agents and see if any help. Keep in mind the results may be worse than what you have now. I'd start with warm water and liquid dish soap. Scrub very lightly with a soft brush if you want; light brushing shouldn't scratch a clad Kennedy half though it might scratch the English penny side. You can then try a coin cleaner product like E-Z-Est. only dip the coin for a second and rinse with distilled water immediately. Repeat if needed. Again, keep in mind anything you try at this point could just make it worse. Good luck, and please post about how it turns out. |
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Bedrock of the Community
Australia
21788 Posts |
Both copper and nickel acetate salts are soluble in water.
Silver acetate salt is NOT soluble in water.
Edited by sel_69l
07/05/2016 01:40 am
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Bedrock of the Community
United States
94367 Posts |
mh1001 - Oops! No offense - best of luck.  |
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Rest in Peace
United States
18456 Posts |
Don't bother with the BBQ sauce . go ahead and use the Acetone for as long as you like , If the coin in question is 90 % silver and has no value to you ,then you can try a silver dip . I never heard of two sided coins that you have .
Edited by T-BOP
07/04/2016 9:17 pm
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Pillar of the Community
United States
6397 Posts |
The coins may be " Magician's coins", where the half dollar is a hollowed shell with a machined English penny (or facsimile) fitted into the hollow. The insert is backed with a Kennedy half reverse so when popped out and inverted the coin looks like a regular half. I have some photos and will post them if I can find them. |
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Pillar of the Community
United States
6397 Posts |
This is a Magician's coin I found roll-searching. It had a 1990-P half as the host coin. The insert appears to be a (genuine?) English penny which was shaved thin and glued onto a genuine, cut-down Kennedy half reverse. The two halves fit very tightly together. I separated them by placing the coin is a plastic bottle and shaking it violently until the insert worked itself loose.    |
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New Member
France
4 Posts |
Thanks for your advices, guys.
Jaobler, you seem really knowledgeable about these kinds of coin. Indeed my two coins are both copper/silver, and although they can separate, it's not the same system as the one you've shown.
Anyway, I will try these methods and let you know what happen. But I think I may end up buying new gimmicked coins (the two coins in the above picture are $50 each......). Because at that moment now they are unusable for my show, unless they look exactly like my other normal half dollar and english penny coins.
I can just tell you now that the washing with warm water and soap doesn't work. Will try some of the products you guys mentioned. Next time, I will be careful before tempting anything that stupid; I would have never guessed that these coins could have such reactions to barbecue sauce, or anything like this.
Edited by mh1001
07/05/2016 12:39 pm
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Pillar of the Community
United States
4471 Posts |
When you apply the different cleaning compounds separate the cooper and silver as the metals can react different to the cleaning compounds. Good luck on getting the half dollars to look like new.
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Replies: 18 / Views: 10,264 |
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Posted 07/04/2016 12:00 pm
