1970 Nickle, redish

I got this in some change. Just assumed it was tarnish or aged, like in some water. Saw that there is a redish, copper hue, read some things about some coins pick up annealing if used in the same oven as whatever had that process done.
Would like any opinions or shared knowledge of what this is of other that age and elements?

 

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It looks like it's been in a fire.

I know nothing about your annealing story.

 

Definitely environmental damage. Not an annealed Planchet. Sorry.

 

Just Environmental Damage

http://www.error-ref.com/improper-annealing/

 

Thanks for the link. It's now in my "Coin Tools" folder.

I learn something new everyday.