1967 Penny yellow penny turns green under bright light lol ?

What composition is this ?

 

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95% Copper
Just a standard Lincoln cent with discoloration from exposure to chemicals, air or other reactants.
Worth 1 cent.

 

I suspect it has more to do with the camera and the type of light bulb you are using than the coin.

 

Yeah, if you're using a regular camera, you might want to adjust your white balance.

Chris

 

The penny turns green under a bright light and all my other copper pennies turn blue under a bright light

 

The coin photography thing can be quite complex. It may take a bit of experimenting to make it come out right. I think it took me 6 months to find out what works for me.
As for having one coin that is a different color. It may have a layer of something on it that can't be seen with the eye. try soaking it in acetone and photograph it again.

 

Ok thanks