Graham Short - who is famed for his microscopic engraving work - etched the words "Nothing is impossible" onto the thin blade with letters measuring just a tenth of a millimetre.
Tenth of a mm? Seems nothing is impossible apart from getting the edge sharp in the first place. You could give yourself a nasty bruise with an edge that sharp...
"Onto the bevel" or "On the edge of the thickness of the blade" I would believe, but not 0.1mm on the edge itself. As Demographic says, if you can put something 0.1mm onto the edge, you've got an 'edge' that could give you a nasty bruise 