so this dime weighs 2.25, which is pretty close to being on point, and I’m trying to figure out if it’s possibly environmental damage or it’s improperly annealed or is it missing it’s clad layer?
I used to do quite a bit of metal detecting awhile ago. A lot of the dimes that I found came out of the ground a reddish color. As @Lon Chaney stated, this is due to environmental damage.
Definitely (A). Most cupronickel doesn't turn dark like that, because most cupronickel doesn't get exposed to the things that turn it dark. But some definitely does. It can be something as simple as excess heat (and exposure to air while hot).
As mentioned, this is 100% environmental damage. The coin is merely discolored from having been out in the elements or buried in the ground. This is what a dime with an actual missing clad layer should look like. Red-brown exposed (inner) copper core on one side, whitish original copper-nickel (outer) layer on the other. Once you've seen a real one, they're blatantly obvious.
As LM posted above it is rare to see a dime missing two clad layers. Most are just missing one and that is quite rare in itself. You could easily do your own attribution by weighing the coin to the nearest 100th. 0.00