Hello Roland,
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"Nagelprobe" is something different! "Nagelprobe" has nothing to do with "Eisenhauer". Even the german Wikipedia explanation is wrong.
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Could you please expand on this?
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"Eisenhauer" means that the blade is able to cut through an ordinary 0.5" (or similar) nail without traces on the edge, except a tiny discoloration.
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Nails are usually made from very mild steel; if you anneal them, they should pose no problem to any hardened steel blade. A thick iron rod may still pose a challenge - it seems more of a test for a good edge geometry (and sword technique) to me though!
Regards,
Kai