My thoughts are that even if this is not the exact procedure, it brings to the point of feasible that such type of thing is possible. I had pointed out some time ago, and to no avail on the PCGS boards that coins with these appearances did not seem IMO to appear until the last 12 to 15 years. Also, I do have some chemical background and the appearance of this "neon" toning is just not like normal oxidation. I am wondering if there is a way to layer other metal oxides on to the surface of silver coins in particular. I asked a couple of the champions of these coins to submit them to spectroscopic and this was all poo-pooed.... It might just be my sensation, but I get the feeling that the market for this type of thing may [hopefully] be panning out...