Would love to be able to edit a material layer to change colors to a MAT (I'm guessing on the terminology). I would love to be able to recolor the beak of this bird for example. While in the material editor I can make basic changes which involve lighting for example, but would like to be able to edit the actual colors to permanently change them.

I've looked in the runtime folders trying to locate the actual mats, figuring If I could find em, I could edit them... but I cant find em!