But Dave , how many cents have you seen that color ? Sure it's all opinions but opinions made by looking at a lot of coins .
Not enough to be either an "authority" or even sure either way, but enough to know this much color on a non-Proof, circulated Wheatie is at best an outlier. The surface of a circulated coin has a different, smoother finish than a Mint State coin and (at least on silver which I'm somewhat more familiar with) toning propagates differently. Like I said, if this were a circulated Morgan we'd be jeering it. Are Cents that much different? I'm willing to listen to my betters on the topic.
Good point, I have seen many old coppers that were so dark that it obscured details and have wished that there were some way to "lighten" them up without leaving them stripped looking.
I'm willing to listen too , I wonder if copper coins have the same progressions of color as say Morgans ?
I wandered the Internet for a while looking for original research - or reporting on research - on copper toning, and came up empty handed. There are people, Charmy Harker for instance, who know a lot about color on copper but nothing really in writing.