Newbie: Question on a quarter

So I'm having a yard sale and was given this quarter. Can someone tell me why it's copper colored?

 

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It's a normal coin that had a hard life.
Welcome to CoinTalk.

 

Welcome to CT

 

Looks like environmental damage. Could have been in the ground.

 

The clad layer of any post 1964 minted quarters are made of a clad layer called cupro-nickel.. That means that there is copper mixed with nickel. Exposure to the elements will affect that copper. This is considered Environmental Damage.
You don't have a mint error.

 

@EricaA1983
Here are many metal detected examples from my finds -

Same issue in Dimes and Nickels.

 

That's a whole lot of errors you have there. $ Cha Ching $

 

Just to clarify.. They are not errors!
Worth face value!

 

Thank you everyone for your input. I truly appreciate it. I have seen old coins that look rusty rus eventually turn green and such but it just looked so different. Thank you for helping me solve the problem.

 

Stick around for a spell Erica.......you can learn a thing or two from us 'rough cuts'......

Welcome.