2001 P North Carolina quarter, (I think) missing clad on both sides question

agreed

 

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This is my first. Im in same novice level with a curious copper quarter

 

Oh. It weighs 5.3 g

 

Yes.. It is called Environmental Damage. The Clad was affected and changed color. Not a Mint error.

 

A true missing clad layer usually occurs just on one side of clad coins.
Here are examples from my collection -

 

Im old with one slow thumb. Could someone expand on what causes this?

 

And here are my metal detected quarters with environmental damage -

 

Thank you

 

Long exposure to soil, dirt, sand, water, heat, chemicals such as soda and juice with acids