whoa. ten pages to discuss this. I cannot read all that before forgetting every point that deserves a response.

I have never seen a SEM micrograph of feather's edge or even shaved with one. Nevertheless I am 90% sure the edge is simply a bur. That explains to me why it works and feels the way it is described.


A bur explains to me why a straight razor when pushed goes from sharp/smooth to sharp/harsh.

I add to qualifiers to my definition of sharp. It must be smooth and it must be long lasting. Such a definition keeps me from referring to a bur as sharp.