Thank you for taking the time to write this up! Yeah, Cody's Lab is great. Would buying gold coins as opposed to bars avoid this issue? I mean, I'd still want

Thank you for taking the time to write this up! Yeah, Cody's Lab is great. Would buying gold coins as opposed to bars avoid this issue? I mean, I'd still want to test using the chemical and electric kits you mentioned. But is it safe to say that you can't hide tungsten inside a coin, and/or is there a foolproof way to detect that---without drilling it---since coins are thin? I really don't want to have to use a destructive test. Since this is a startup site, if the answer to my question about coins is negative, I wonder if there could be a market for gold that is shaped in such a way that it can be easily verified? I did run across an outfit selling tiny gold "squares" that you could break off and give to people, but can't find it now. So maybe the idea of gold that you can 100% verify at home has already been done, though I don't think that was spiel.