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A lot of barber hones are "coated" with an abrasive that does not go through the entire hone. lapping it , reduces its cutting ability.

Some barber hones you don't lap,,,,,,,,,,
The Koenig,,,,,I would pick an edge & lightly chamfer it with a DMT ,,, if it turns to a muddy slurry & chamfers easily/fast,,, then its done, as Utopian...