mike

congrats! You're famous!!!!!!!!!!

Not being an expert or really smart about this subject but the toning look very uniform across all the coins.

When I was in high school (a very long time ago) the teacher shatter a grape and a rose by immersing the in liquid nitrogen first. The sounded like glass when they broke and then when they defrosted, they were back to normal. So I imagine that metal will have the same results.