Silver ice test [gelöst]

A while ago I read somewhere that a 'ping' test or an 'ice' test can be done to determine whether or not a coin is made silver. Please can someone point me to where more information can be found about these tests?
Thanks Graeme

Some links to start with:
https://www.youtube.com/watch?v=leZ_TwAPlqk
https://en.numista.com/forum/topic4060.html
https://en.numista.com/numisdoc/determining-the-metal-of-a-coin-27.html

Silver coin Ice test.
https://www.youtube.com/watch?v=bEsyy5oczQg

Thanks for the replies. Very helpful. I'll try the ice test. Graeme
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So, the principle of the ice test ....
- the coin is conducting heat from the solid surface below it (like a table) to the ice
- the faster the ice melts, the quicker heat is being transferred through the coin to the ice

Now here is the important part:
- the speed at which heat will be transferred to the ice is proportional to both the intrinsic conductivity of the coin, and its dimensions

So the test will give best results if you compare a coin of unknown composition to one of known composition, and about the same dimensions.

Good luck!