It seems a certain teacher, with 19 years’ experience teaching chemistry, has written a guide, for buyers on eBay, to help them avoid getting ripped off by the (tiny) minority of eBay sellers who sell fake silver. If you buy silver on eBay, or just want to verify that some silver you have is real, you might find this useful, so I’m posting a link to this guide right here: http://www.ebay.com/gds/Real-or-Fake-Silver-A-Chemistry-Teacher-Explains-How-to-Know-/10000000205613973/g.html.