Yes. I've been stacking for about 2 years. The coolest way I've seen to confirm authenticity was this device my metals dealer used in front of me. I'm not sure exactly how it works, but I think it sent vibrations or some kind of electromagnetic wave through the silver bar, and it matched the frequency to what silver should be.
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That is in part 2, see below. its an ultrasonic thickness tester that measures sound.
https://steemit.com/steemsilvergold/@silverstackeruk/how-to-spot-counterfeit-silver-bullion-check-your-stack-part2-51