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 Replies: 17 / Views: 6,564 |
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New Member
 United States
8 Posts |
Where should I have posted this? I wasnt sure exactly what forum. Thank you
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Moderator
 United States
23731 Posts |
 to the community |
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New Member
United States
8 Posts |
Bump for an expert analysis!
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New Member
United States
8 Posts |
Is there anyone who can help me with this question?
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Pillar of the Community
United States
1962 Posts |
They're both genuine, typical low grade El Caz. There's nothing on either piece that indicates fake. If you have any interest in furthering a collection of shipwreck-type coinage, you should view multiple pieces on ebay, or the Sedwick auctions, etc., to get a better feel for how sea-wear presents itself on salvage from this and other wrecks. |
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New Member
United States
8 Posts |
Thanks so much, a local jeweler in my area told me they were 100% fake(probably no knowledge of shipwreck coins), I had zero doubts before that. Thanks again.
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New Member
United States
8 Posts |
Half reale in first two pictures turned out to be FAKE. The coin turned GREEN! I'm guessing white copper. I got this coin from Sahara Coins.
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Pillar of the Community
United States
1801 Posts |
Please some clarification
What do you mean "the coin turned green"? Did you put something on it? Was it stored in a PVC envelope and picked up the green slime? Does the green come off in an acetone soak? Did you ever weigh the coin? Did you preform a specific gravity test on the coin? Inquiring minds want to know the answers to these questions so we can help you determine what is going on with the coin.
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New Member
United States
8 Posts |
The coin was placed in a setting and worn. I have not tried any of the things you listed as I am extremely new to coin collecting/metal detecting. I hate to make assumptions but silver turn black not green. Here are a few pics: [URL="http://s959.photobucket.com/user/shannonferguson2000/media/elcaz2.jpeg.html]  [/URL] [URL="http://s959.photobucket.com/user/shannonferguson2000/media/elcaz.jpeg.html]  [/URL] |
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Pillar of the Community
United States
2543 Posts |
Quote:
Half reale in first two pictures turned out to be FAKE. The coin turned GREEN! I'm guessing white copper. I got this coin from Sahara Coins. The lesson here is to not bring your coins to people that know nothing about what they are looking at. These coins are not solid .999 silver, they contain traces of other elements one of which is copper. A common occurence with treasure coins is that being under water for so long, the copper leaches through the silver to the surface. The green is the copper that has leached through, it is not an indication that it is fake. Edited by denco7
06/02/2013 9:44 pm
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Pillar of the Community
United States
1801 Posts |
I would suggest a soak in pure acetone (acquire at your local paint store, just make sure it is pure acetone). The acetone will not have any affect on the metal but will remove/dissolve any organic compounds on the coin. Since you have been wearing the coin, my guess is the reaction on the coin is somehow related to your body heat/oils/etc and the copper in the coin. As for denco7's comment about the copper in the silver coins....yes the copper tends to leach out in sea water but that leaves the surface of the coin with a slightly higher silver content, not a higher copper content. I do not believe the copper "moves" through the coin to the surface but I could be wrong. ColonialJohn on this site would be the one to ask, or BadThad on the general coin forum.
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Pillar of the Community
United States
2543 Posts |
It leaves the entire coin with a higher silver percentage, and it does bleed through the surface and when it oxidizes on the surface it will turn green. And of course that happens when it is put in a pendant and is exposed to the air. Here is ColonialJohn's thoughts also Quote:
Shipwreck coins are interesting ... the copper and zinc leach out of the coins due to seawater action ... the %Ag on these coins do rise up ... I have recorded some in the 98-99% Ag range along with silver surface enrichment effects. Its common to see them with this coppery surface ... its the copper ... bleeding out ... in some cases.
John Lorenzo
United States Edited by denco7
06/02/2013 9:55 pm
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Pillar of the Community
United States
1801 Posts |
Excellent explanation for the green effect.
Edited by jfransch
06/03/2013 12:11 am
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New Member
United States
8 Posts |
Well now I feel dumb, I'm getting alot of misinformation from "professionals" in my area. Thank you for all the help. Now if I can pull a Spanish out of the sand.
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Pillar of the Community
United States
1801 Posts |
Just be aware shaferdady1 that they are ugly when they come up off the bottom. These 2 are just minutes out of the sand off the Florida Coast.  |
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Posted 05/24/2013 8:15 pm
