1979-D Lincoln - Red Color

It is sometimes hard to capture color variations when photographing a single coin, here is an interesting red color I saw while sorting 1970's BU cents.

 

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The other 3 are actually RED according to the established numismatic color code. The Cent in question would be RED BROWN due to natural toning.

 

Here is the color chart -

 

I see, "L E F O D P C T". Oops, wrong chart.

 

Not red. I disagree on the red brown.
It looks pink from toning and doesn't fit anywhere on the chart.

 

?

 

I don't see the color of that coin anywhere on the chart.
Just a toned copper cent to me.

 

You suggesting "questionable color"? The whole top is a smeared strike, or PMD.

 

Remember, bronze is a fairly reactive alloy. It's capable of a good many colors.

 

Pink Salmon Brown.. Maybe?

 

What is the proper term for the circular mark at the top of last 79 D photo?
I have many coins with this mark.

 

If it's the faint line going through IN GOD then that looks to be a result of Die Deterioration

 

Thank You. I've only found one coin that had this mark on obverse and reverse.