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  1. I am suspicious about a spoon, which was sold as 800 silver (its stamp is nearly completely faded). I have heard of the ping test for coins, where you can use apps to analyze the frequency (in my case: "Spectroid") of the ping. Can I test this for (solid) silver cutlery too or is their frequency completely different to a coin with the same silver content? Here is the sound of the spoon: and here is the one of a 800 silver coin: https://soundcloud.com/wolfgang-marzipanium/800a. A picture of the analyzed frequencies is attached down below, comparing the cutlery ("Besteck"), a 640 and a 800 silver coin. Do you think, that I can trust these results, so I can say, that something is fishy about the spoon?
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