A woodie is an improper alloy mix, which gives the cent a wood grain appearance. I don't think it creates a high value, but people like the way they look.
The wood grain effect is caused by toning (Oxidization) of the metal. different metal composition equals different color toning. There are many different methods of "Cleaning". Some with chemicals have the potential to cause toning.
Here is a double mint error from my collection.. Off center strike with improperly mixed alloy (woody)
Glad to hear I'm not crazy..."environmental damage" https://www.cointalk.com/threads/im-having-trouble-calling-this-one.353758/page-2#post-4017151
No. woodie effect is either going to be environmental "damage" or not. A woodie cannot be created without environmental exposure. So it can only be one or the other.
I really do admire your determination to suffice me paddy. I know I'm difficult. I do appreciate these conversations.
Let's see if I can clear this up for ya. A woody occurs when the different metals in the coin are improperly mixed during the melting process. There are several ways this can happen I believe. One is if there is not enough heat and movement during the melting/combining process. What a woody coin will eventually look like depends on it's environment and how the different metals tone in that environment over time. A woody does not need to be toned to be classified a woody. They are harder to spot but they are still woodies. The actual cause of a woody is NOT environmental it is a process error. Only the toning after the minting process is environmental just like with any other coin. Just because I really like this one here is a Canada Small Cent Woody from my collection.
Therefore most woodies will be classified as environmentally damaged but not limited to the environmental effects that can enhance the characteristics? I would like to see an example of a bright woodie. This ideaology makes it difficult to classify due to the brown oxidation that contributes to the "wood" appearance. P.S. that is a beautiful effect on that coin.