Improperly Annealed Planchet or Weird Stain?

I have been struggling with the issue on this coin and haven't a clue what the exact issue is if that makes any sense.
It looks like some kind of stain or damage to me but not quite sure. ??
It looks like an Improperly annealed planchet, but I haven't seen one like it so far.
Don't be shy. Give me your feedback please.
If not, no problem.

 

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I would call that one a stain.

 

Check it. Does this help?
Search: improperly annealed planchet

 

Besides a stain it looks normal to me. I am interested to hear what others have to say. Does the area look like it is peeling?

 

Doesn't appear so..

 

Try soaking it in acetone for a few hours and see if is changes the color a bit.

 

Higher resolution image might help. There seems to be a raised edge around some of it but it's hard to tell.

 

Not an expert, but it looks like a stain. It looks to be the same color that one of them becomes when just left in circulation long enough, and a number of substances would produce that color rather quickly.

 

Thanks all. I'm convinced it's a stain also.

 

Here is the Orange seen on some of those improperly annealed.

I was looking for a nickel with the burnt orange tone. Couldn't find it. Tones can be decieving

 

Given the metss as is in the Presidential Dollars I would go with a stain.