Blue Shadow on LMC

Can anyone explain what causes this blue shadow around Lincoln and other places on the penny?

 

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Maybe it was previously painted blue and it peeled off?

 

Heat ,environmental damage,

 

Thanks. The reverse doesn't have as much discoloration. However, it does look like it has a die break and a die clash.

 

Have you tried using a different background color?

 

Hmmmm, it's the exact shade of color blue background your coin is sitting on....

Can you explain that?

 

@alurid @Islander80-83 I tried it with white background, black background and no visible background. I think the camera is picking up some blue and the background look blue. The first pictures we taken on a white background and it showed up blue in the photo. Here are some with the different backgrounds.
The shadow is actually just a dark boarder. It must have been caused by some environmental exposure.

 

I'm just giving you a hard time @Inspector43. Yes, environmental exposure or some kind of chemical reaction probably caused it.

 

I appreciate good fun and my moniker up there is "sarcastic". But, is the camera picking up the blue haze on the coin and overriding white or what ever? Black or white backgrounds both show up as blue. Also, thanks for the feedback.

 

You got me.

 

I'd like to revisit this. Could the indications be the result of the split plate effect?

 

From where I'm sitting?.. Not a clue.

 

Copper does tone blue under the correct conditions.

 

The blue color on this coin is due to a chemical reaction with contaminants.

 

Looks chemical on this one but I’ve seen heated ones with blues and yellows

 

Thanks everyone. I'm going with chemical reaction of some kind.