1991 d think it might be a foreign planchet or something not sure

Wish I could take better pictures. Any help identifying this coin and why it looks like steel

 

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Not a foreign Planchet
Environmental Damage on a Copper plated Zinc Cent
Or de-plated (plating removed) post mint

 

I agree with Paddyman98. It does have a cool ridge ring on obverse though.

 

Dark, dull, and grey = De-Plated

 

Do some 'speriments on the post-1982 cents. It doesn't take very much to turn them all kinds of nasty. Start with a little cat pee and go from there.

 

Just vinegar will do almost the same thing. I took some old junk cents and soaked them in vinegar to make my own wood stain. Comes out a very nice green.

 

Well, for the time being, having just moved with a cat, and without having done my stock-up grocery run yet, I have more immediate access to cat pee, for now.