Stan_Daniels
Well, i used an app on my iphone to test with 2 coins:
- first was Canadian 999.999 silver coin and the metrics didn't change (around 55)
- and this fake coin as second one and the metrics went down (why)
So, silver can't be found with a magnet and the fact that there were no changes in magnetic field is 100% fine. But if the metrics went UP, then this would mean that there is FE (ferrum) in a fake coin. Why the metrics on the app went down? Probably that's silver, but not 100% clean? can't get it
That app just acts like a glorified magnet that measures the magnetism of an object over the background noise (55 in your case). It should go up when near a ferromagnetic material but remain the same otherwise. It should never go down. How low did it go? Did you orient your phone differently than when you took the background reading? If the object is in your hand (not underground) then a common strong magnet will be just as useful.
Actually, I could get it to go down by positioning it between two magnets but I'm guessing you didn't do that.