1966 Lincoln Cent With Odd Color

While I do appreciate the vote of confidence, I note that much more often it is the dedicated members of CCF rather than the mods who are experts at answering questions about coins. For me specifically, I'm wrong about once per day on these things, but still excited to be learning. Better would be to rely on the mods to move threads to the correct subforum (such as I have done for this one) than treat our answers as gospel.

Copper can take on almost any color of the rainbow in different environmental conditions.

Environmentally-influenced toning, yes. Copper is a very reactive metal. What does the reverse look like?

It's most likely toning of some sort.

Just common environmental toning. Remember copper chemically reacts with its environment. There are innumerable circumstances to which this coin could have been exposed since it was made to turn it a different color. Possibly more than one circumstance occurred.

Is this showing up differently on my monitor? I don't see anything except a normal copper-colored cent with what appears to be tape residue on it. It looks nothing like a 1943 steel cent on my end.

environmental staining. The weight is just at the light limit.