Sapyx ✭✭✭✭✭

Even in a country like the US where "finders keepers" is the general rule for finding lost treasure, there are recognized exceptions. You can't go digging around a Civil War battlefield or … (View Post)

When copper oxidizes, two compounds can form: copper(II) oxide CuO, which is black. And copper(I) oxide Cu2O, which is red. Under "normal" conditions of a coin in circulation you typically … (View Post)

The rainbow colours seen on oil slicks, soap bubbles and on your mylar coin holders are caused by the thin film effect, and can be generated whenever you have a "thin film" of something sit… (View Post)

I am indeed in Australia, and don't get overseas very often. I visited North America back in 2023 but didn't arrange to meet up with any forum friends, as I was just in South Carolina with my mum vis… (View Post)

I humbly accept the acclamation and shall adjust my sigline accordingly. B) (View Post)