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Facts & Trivia, Numis Tips, References

Spot Counterfeits Silver Coins using Rare Earth Magnets


With thousands of counterfeit/fake/replica coins coming out right now, it would be practical for the collector to ensure that they are purchasing the authentic ones. A fake silver coin can be quickly detected using a neodymium rare earth magnet.

Here’s how…
Hold the coin at an angle of 45 degrees, place the magnet at the top of the coin and then let it slide.

Fake:
• If the magnet sticks to the coin. (Silver is basically non-magnetic)
• If the magnet slides straight right off the coin.

Genuine:
• If the magnet slowly slides down the coin.

Science behind…
Magnet passing to a non-magnetic conductor creates eddy currents. The intense magnetic field, created by the rare earth magnet, induces a current on the coin, creating an opposing magnetic field. The two fight it out, slowing the slide. Not magic of course just magnets.

Notes…
• Sliding magnets can cause micro abrasion on the coin surface. Use plastic coin pockets if neccesary.
• Silver plated metals will repond and might have the same effect. Skills and experience are still needed.

Here are some videos… Enjoy…

Extra on Eddy Currents:

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