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Originally Posted by Delvo  The books don't say all Elvish weapons are supposed to glow like that. Only one or two of them in the world are said to do so. Frodo carries it (or one of the two), and none of the other main characters do. The movies have this correct. |
But no-one is actually saying that all elvish weapons glow. No-one has mentioned that the white knives of legolas glow - because they don't. However it is clearly mentioned in The Hobbit when the three weapons are discovered - Orcrist for Thorin, Glamdring for Gandalf and Sting for Bilbo. All are weapons that glow in the presence of orcs. That they are elven weapons does not necessarily imply they glow... it is that Tolkein stated that they glow that is relevent.
I do also believe that during the Moria chapters it mentions something about Sting and Glamdring both glowing before they are attacked in the tomb. Also during Gandalf's battle with the Balrog.