Best test for Silver items Using coarse stone and 18K acid 100% accuracy

The first video here is older showing a few silver fakes... The second video shows the on a stone w/ 18K acid test. I may produce a fresh just for Steemit video showing a brand new extremely easy no tools method for testing THOSE PESKY FAKE SILVER in all types COINS COMING FROM ASIA I use this silver coin test almost daily now and it has thus far had a 100% accuracy and is super quick, easy, no tools, and at least for now un-fallible.