1974 Brown colored quarter

I was looking through my change and I came upon a strange looking quarter. It's a 1974 quarter, but you can see that there is a brownish copper look to it. At first I thought it was just rust or discoloration but as you move it around (especially in sunlight) the color moves too. Can anyone tell me what could of caused this and is it worth anything other than face value?

 

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were did you find it???

 

just in regular change from the store.

 

did you try an clean it???

 

yeah, and it's not something that was added on to the coin.

 

its just gunk/ build up, theres nothing special about it. my parents used to own a gumball company in the malls and we would get these all the time.

 

No, it's not gunk. It has a sort of rainbow effect. If you look at the coin from a certain angle there is no brown/copper color.

 

oh, hmm well then i guess i dont know.

 

Old spray paint or some sort of paint? The coin is a '74 circulated so it's been handled.

 

Part of my quarter also colored in brown, is this a mint error or PMD?

 

I just got one today and is color copper. Is this worth anything