Lunar Dragon wrote:On the back side of each PCGS slab is a hologram that I assume or sure hope cannot be accurately forged. Question: Do the forgers/counterfeiters who slab their own coins with bogus holders usually focus of faking the high-end coins that go for 5 figures today?? Or do they also fake more common date gold such as Liberty or St. Gaudens $20 Double Eagle gold pieces??
Plated copper acts rather CLOSE to silver. This is because the test works by....the moving magnet induces an electric current in the metal, which in turn creates a magnetic field in the coin under test, which reacts with the other magnetic field from the sliding neodymium rare earth super magnet, to magnetically significantly slow the motion of the sliding magnet a good bit. Copper is ALMOST as good of an electrical conductor as silver, and so creates ALMOST as strong of an induced electrical current (and hence ALMOST as strong of a magnetic field) as the real silver will. Trial and much experience, with known real silver and known fakes, will help you, by reason of having your senses exercised, to discern real from fakes. obviously steel, zinc, and pot metal fakes will show obvious differences from a real silver coin, but copper fakes are harder to detect with this test, Trial and experience. You can get good enough practicing that you can have a good sense of a silver coin being real, enough so that carrying a tiny neodymium rare earth super magnet is worth it. Practice on old real solid copper pennies (pretty 1982) against old silver dimes (pretty 1965), to get used to the slight differences between silver and copper. Just keep that magnet away from your magnetic strips on your credit cards, or else they can be erased. Oops.