Not sure how this damage happened. Does anyone have any idea what could have possibly caused this? Im sure you pros can educate me some.
Yeah, that's a real strong acid, that one was smoking when they pulled it out. When you see the bumpy surfaces like that, that's acid.
Hi, good images! it seems an effervescent tablet partially dissolved Similarly, if an acid attack the coin is an alloy of nickel and copper where the nickel is more reactive, maybe this explains the excessive porosity. Now...if there was a partial melting of alloy so the copper is the first to melt and remains an excess of nickel. It is only a opinion.