2011 Rainbow Penny with Die Error??

Looking for some help on this penny to determine if it is unique - It appears to be a rainbow penny with some sort of die error or ddr on reverse - It looks like a 1 above shield

 

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Stained/discolored obverse

Although the photo of the reverse isn't great,
it appears to have a liquid or someone on the
surface, plus lots of scratches.

Everything you see as 'different' on it occurred
after the coin was in circulation.......sorry

 

Looks like the green goop used to fill up tires with cracks lol.

 

I've mentioned the following plenty of times..
Could be dried urine. When it dries it leaves rainbow tones. Always wash your hands after handling coins.

 

Is that because sometimes urine has sulfur in it and sulfur tones coins?

 

Uric acid