Toned and dirty coins

I was nickel coin roll hunting and came a cross a lot of toned and dirty coins. Does anyone know what causes this?

 

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They were in a toilet, urinal, fountain, pond, dirt, or something.

They aren't toned.

They are environmentally damaged.

 

Getting wet with something -- roadside/parking-lot water, spilled soft drink, sweat -- and then sitting long enough to corrode.

Edit: or, as @physics-fan3.14, other body products.

Welcome to CoinTalk! Now, go wash your hands.

 

Thanks

 

Metal detecting finds that are dug up and then put back into circulation.

 

I thought that's what it might be, there is just so many at one time.

 

I don't ever want to reach that far down in a toilet.

 

Here are a few I got today. That quarter is gnarly. And you can see one of the nickels and dimes are as well.

 

Protect those dirty coins with a slab!

 

Welcome to CT Chris. That does seem like a lot of dirty coins. How many rolls did you search to come up with them? Unless you can find any with errors, I'd re-roll them and send them back, and as @-jeffB said, "Now, go wash your hands." LOL