Board Thread:General Grimm Discussion/@comment-151.245.239.95-20141205174543/@comment-81.132.75.218-20150110223429

I have always presumed half-woge is mostly an emotional sort of thing which Grimms and other Wesen can pick up on, perhaps with any internal differences being heightened (but not to the point of being revealed as a Wesen). It is possible Wesen give off EM radiation (like ultraviolet, etc.) when half-woged that allow Grimms and other Wesen to see their woged-form (indeed allowing for the possibility of a technological form of detection), or perhaps it is telepathic or some other pseudo-science explanation that rules technology (as we currently know it) out.

Full-woge I presume is when something external changes (or extreme internal change), which of course can be seen by anyone. We know that it is possible for Wesen to only full-woge part of the body; so something like that tongue could be a full-woge without the rest of the Wesen being full-woged.