| Author |
Replies: 56 / Views: 5,381 |
|
|
|
Pillar of the Community
United States
1757 Posts |
Over the last three years I have been studying world contemporary counterfeits. Currently my company probably makes the best XRF device on the market (EDAX, Mahwah, NJ). I will be doing some work with Mike Diamond in Coin World on some off-metal planchet errors. I am also coming out with two books with other authors with some of my XRF studies. The 20th Anniversary of William Anton's Forgotten Coins book probably in December 2012 and a book on Contemporary Counterfeit 8 Reales through the ANS in late 2013. I normally charge $50/analysis for a coin if you are interested on an assay. This includes P&H. Sometimes just P&H depending on the circumstances and what the data will be used for ... say for research or if you are a C4 or EAC member. The predominant new fakes from China for silver coins are normally iron/nickel alloys but they have improved to german silver. The smooth new edges are key say for 19thC fakes as there are usually tell tales signs without the usual problem of remembering certin die breaks for this certain dated/mintmark coin which is normally difficult. Actually - there are hundreds of fake 8 Reales in TPG's and these are Sheffields. What are Sheffields? Wait for the book <BG>. John Lorenzo United States
Edited by colonialjohn 07/31/2012 3:33 pm
|
|
Valued Member
 United States
161 Posts |
You can not carbon date a coin if there is no carbon in it. You could I suppose studdy the patenia in some cases butnot the coin and this doesn't help with coins that are not ancient.
If a coin to were use the correct alloys we will get to the point where any new discovery will have to be dismissed as a possible fake.
|
|
Bedrock of the Community
13014 Posts |
Quote: THIS is the only true way to counter the first quote. Carbon dating. How expensive will that be though? TPGs will raise the roof on grading if they have to lab test coins. I would imagine it wouldnt be that bad, once its implemented and stream lined. The + service at PCGS does similar type things for detecting cleaning and recording the coin and doesn't have a huge price difference. But I also imagine they could also just use it for high value coins and coins often faked. If someone wants to fake a mid level 2012 penny or something that has such a high mintage like that a few more wont hurt and may not require the full use of the technology. At the very least they should be aware and make every effort to not raise the price to much or it will cost them business. We at least have the fact they do massive volume on our side for keeping the price down. If it got to bad like is being theorized here I could see the government kicking in money to at least the big two for these machines as it is in their best interest as well to weed out as many fakes as possible Quote: You can not carbon date a coin if there is no carbon in it. I was just using a general term. Theres ways they can date metal and other things. With the science currently around dating whether or not a coin was made 100 years ago like it is supposed to be or 2 years ago should be doable.
Edited by basebal21 08/01/2012 12:14 am
|
|
Valued Member
 United States
161 Posts |
How can you date when a coin was made? I didn't think this was possible esp within the last 100 or 200 years.
Most of gold we use in circulation today has been recycled many times over. Would such a test show the first,last or ever time it was melted and poured into a mold?
|
|
Bedrock of the Community
13014 Posts |
Quote: How can you date when a coin was made? I didn't think this was possible esp within the last 100 or 200 years.
I imagine theres ways to more more accurately date them, but at the very least the method. They didnt have the machines we do now. If I had to guess though metal purity, how long its been in that shape, time surface has been exposed could all come into play as well. Counterfitters will presumable want it to be as fast and cheap as possible and if they are that good will have modern presses ect. I highly doubt any counterfitter would use the same methods that were used 100 or 200 years ago which lead to no two of those coins looking exactly the same. If they wanted to fake real modern coins itd be more difficult, but again most of those have such high mintages that adding another 100k to a mintage of 2+ million isn't a huge deal in terms of destroying value
|
|
Bedrock of the Community
United States
17884 Posts |
Actually what you be looking at is characteristic isotope ratios. For example most of the silver brought to the CC mint would have probably been of local production and would have the ratios typically found in the local mines. (The metal from every mine has it's own characteristic ratio of metals and isotopes) A counterfeit made later would most likely be made from silver from other or additional sources and the ratios would be different. A compiling of records of the ratios of genuine pieces is work that needs to be done.
|
|
Pillar of the Community
United States
759 Posts |
Conder, Wouldn't that need something along the lines of a GC/MS analysis and consequently a destructive sample?
|
|
Pillar of the Community
United States
863 Posts |
I thought the fakes usually arnt even made of silver. to really be able to trick us they need to use the right materials
|
|
Bedrock of the Community
United States
20753 Posts |
Quote: What are Sheffields? Wait for the book <BG>. Yes one more book on fakes. And if a few hundred sold, wouldn't much help the millions that buy and sell fakes every day. Quote: was just using a general term. Theres ways they can date metal and other things. With the science currently around dating whether or not a coin was made 100 years ago like it is supposed to be or 2 years ago should be doable. I don't think the average person will EVER have machinery or expensive tools to detect a fake coin. Picturee the average american with a large X-ray machine in his living room.  Quote: A counterfeit made later would most likely be made from silver from other or additional sources and the ratios would be different. A compiling of records of the ratios of genuine pieces is work that needs to be done.
And again, just who would have all the things required to figure out the material in a coin? And who would spend the money on one if there was one? All the possible methods of detecting many fakes are just out of reach for possibly 90% of the World. Maybe more.
Edited by just carl 08/01/2012 11:10 am
|
|
Valued Member
 United States
161 Posts |
Can you get an isotobe rating without destroying a coin? If that information was out there so everyone could use it then so could the bad guys. They could also melt down old coins from that mint either damaged coins or an equal substitute from the same mint of far less value. Perhaps too much work for a $500 but not a $50,000 coin.
|
|
Pillar of the Community
United States
3453 Posts |
Quote: IMHO there have been fakes out there longer than there has been coin collectors...Educate yourself read books study photos... CaptainMorgan has a very good point. I just got back from Bath, UK and they had a display with Roman coins found in the baths (I was in heaven). And in the display, they had counterfeit Roman coins that had been thrown in!
Edited by CoinsKelly 08/01/2012 4:17 pm
|
|
Bedrock of the Community
13014 Posts |
Quote: I don't think the average person will EVER have machinery or expensive tools to detect a fake coin. Picturee the average american with a large X-ray machine in his living room. I agree, it would be on the TPGs to have the machinery. If fakes were so bad TPGs were forced to implement this quickly I dont think many people would be buying raw coins on their own. Even if they wanted it raw it would be wise to buy a slab and crack it
|
|
Bedrock of the Community
Australia
21788 Posts |
Some methods of suspecting fake coins require NO investment in testing equipment at all!
The categories denoted A, F, H, J, M and N in my list are well worth considering by the novice collector.
Do NOT be defeated, learn instead.
|
|
Bedrock of the Community
United States
17884 Posts |
I know elemental analysis is possible non-destructively, I don't know if it can be extended to isotopes. But even elemental analysis would be a big first step. And of course the average person would not have this equipment but the TPG's would and it would be an aid once the counterfeiters get good enough to produce fakes that can't be visually detected. And the equipment is getting a lot smaller. There are now hand held devices that can determine elemental compositions. And some of your better gold counterfeits are made by melting down genuine old US coins to get the trace content and color right.
|
|
Bedrock of the Community
United States
20753 Posts |
Yet the biggest problem is that the majority of people that buy coins will just not get involved in attempting to prove or disprove authenticity. Actually most people don't even know about fake coins. Many would not even know about TPGS's nor how to figure out what or who they are and what for. People here on this and other coin forums sort of assume that people are coin savy, but they just aren't. I've met so many people at coin shows that would buy almost anything as long as so called PROFESSIONAL dealer says it's OK. I remember talking to one guy that said he was collecting for years and never knew coins could be even made to look like the originals. Just ask almost any freind, neighbor or relative about coins and you would find that Numismatically informed people are the minority. And a real small one too. There are possibly many thousands on coin forums but there are many, many millions that have no idea about faked coins. Ask the average person about a book on coin couterfeiting and you'll probably hear, HUH? As I said before, there are so many out there now with faked coins and will never know until they attempt to sell. And even then, may never know.
|
| |
Replies: 56 / Views: 5,381 |