Cool. Looks like someone wrapped it in a Taco Bell napkin and let it bake on their dashboard for a few months.
Yep. Copper nickel coins aren't as chemically active as silver, but they will tone. I think yours Tim was just placed in an environment that naturally promoted toning. Nearly all metals, (gold is an exception), will oxidize, (tone), over time. Some are just more reactive, like copper and silver.
