Washington is dull but only half way! Was he made that way

Let me tell ya as much as I try to educate myself I look at examples that the reputable site show with the error definition and the ones I find seem to be similar but as of this moment I haven't been correct once with my judgement of the error coin in question. So asking those who know more then I do makes sense. So thank you all I appreciate your feedback.I remember reading something about pennies that were missing the copper layer in lamination I might be rembering wrong but basically it stated that the coin would not be spotted with missing layer it would be a 1/2 or 3/4 or x/x when I found this one I put it aside I'm not sure if even possible on quarters to have similar type of error or if I even have my facts correct.
So here we go,

 

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Your coin may of had some coating on it, like glue, paint, tape or similar substance which protected it from abrasion of normal wear. but it has recently been cleaned off. I don't think it is any kind of error from the mint.

 

Whatever occurred did not happen during the minting process. It is just some kind of Environmental Damage. Some Chemical or element that affected the Clad Layer.

Not a mint error.

 

Let me ask you is there recommended site or book that I can look with more detail into coins and collecting or is this misjudgment part of learning or maybe I just suck and need to get a different hobby. Hopefully little more learning what I going to do collect rocks?

 

Here is a site with some good info.
http://doubleddie.com/58201.html

 

Thank you at least I'm getting a good idea of what not to look for with what I found so far

 

Before I post anything else in going to take some timeand look at the link you gave me become better informed thanks paddyman and alurid for all you help

 

@Christopher Taylor
Here is one for Mint Errors
http://www.error-ref.com

The one given to you before is more for varieties. There is a difference.

 

If you're into books as opposed to online reading, Alan Herbert's book on errors is an excellent source.



Chris

 

Deliberately damaged

 

Correction: Just so I’m not throwing bull#$ facts I would like to alteast let be known in case anybody trying to learn reads this forum. My commment has wrong info what I was referring to was Annealing error in case you like more info on that a simple search online should show you everything in regards to Annealing. Thank you to Steve for the great resource that help me indentify this and other untruths I had about coin collecting