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Message:: [QUOTE="Blaubart, post: 1540322, member: 37498"]There is another test you can do with magnets that will help determine if it is indeed 90% silver. It's called a magnet slide test. You'll need at least a few rare earth magnets to perform the test. Clad coins will slide across the magnets with no effect, but the movement of a 90% silver coin across a magnet will generate an inductance which slows the coin down as it's sliding across the magnets. [video=youtube;3gUjuS5TzwI]http://www.youtube.com/watch?v=3gUjuS5TzwI[/video](The part where he uses the slide starts at about 2:45) Keep in mind that pure or nearly pure copper creates the same effect, but nickel is so highly non-magnetic that it destroys this effect, which is why nickel clad coins slide down with no resistance despite having a copper core. The best way to use a magnet slide is to compare your subject coin's behavior to a known genuine silver coin of the same type, because 90% silver quarters will slide at a different speed than 90% halves, and a greatly different speed than 99.9% bullion coins. If you don't have several good magnets, you can also do the test by sliding one magnet across the surface of the coin, but with coins as small as a quarter, the effect is very hard to observe. You can also feel the effect when you move a coin rapidly towards and away from the magnet. The movement will cause a slight magnetic resistance which makes it feel like the coin is moving in fluid. Sliding the magnet across the surface of the subject material works best when the material is large, like these 100 oz bars: [video=youtube;NgSXg-WOEVY]http://www.youtube.com/watch?v=NgSXg-WOEVY[/video] Hope this helps![/QUOTE]

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