Billy wrote:
"Jürgen Exner" wrote in message
news:UIThf.547$tg3.255@trnddc02...

Oh come on! Unless you fill your tank with hydrofluoric acid there
isn't really much that would be able to corrode gold.

Acquiring gold that is pure enough to not contain other metals (ones
that will corrode) could prove both difficult as well as
prohibitively expensive. Nickel, zinc, iron, etc.....

True, but the OP was explicitely talking about gold coins.
And those are typically almost 100% pure gold.

jue