I always saw it as the swords containing a form of melted Mithril, and that with the Elves inhearent magick made them glow when their hated enemys, the orcs, were near. But I honestly have no idea how I came up with that. Just my odd speculation...
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Rock-a-bye Nazgul, on Weathertop, when the Ring calls, the horses will run. And when Sauron calls, the Nazgul will go, and down will come evil, Ringwraiths and all!
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