One more thought on e.t. vs. terrestrial material; Meteorites contain more Iridium than earth materials, and you could probably do a spectrographic analysis to detect that material without doing any more damage to the blade than a restoration cleaning.
These days, of course, store-bought Iridium could be incorporated into a blade, but it would probably be as much expense & trouble as using real meteorite and not give you the right trace amount, so I don't see deliberate fakers going down that road.
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