Sapyx ✭✭✭✭✭

You don't need oxygen to tarnish silver; silver oxide does not readily form under normal circumstances. What you do need is some source of sulfur, as silver sulfide forms readily. Silver is actually … (View Post)

That would probably work. Methionine itself isn't volatile but breaks down and releases the sulfur when heated. There's not a lot of methionine in typical coffees though. (View Post)

For a more detailed identification: Gordian III, silver antoninianus, reverse AETERNITATI AVG (to the eternal emperor), the sun-god Sol standing. The coin does not bear a date or mintmark; stylistic … (View Post)

While the question itself is entirely hypothetical (since such a re-openeing would be excessively improbable), the related question is more meaningful: what mintmark would be adopted if a new mint we… (View Post)

For me, that would be the New South Wales Holey Dollar of 1813. Only a couple hundred known in existence, and half of those are in museums. Historically, been about the same price as a suburban house… (View Post)