Science of Sharp

Obligatory link to the amazing blog about knife sharpness: https://scienceofsharp.com/

https://scienceofsharp.com/ is a great contemporary source for how to sharpen stuff, and what that actually means under a microscope.

Abrasion absolutely happens when stropping, however it is very mild compared to other sharpening/honing processes. This is by far the best resource I've found for explaining sharpening and the concepts of sharpness vs. keenness: https://scienceofsharp.com/ I don't go nearly to that level of effort in sharpening, as I only sharpen pocket knives, kitchen knives and various tools, I don't bother with straight razors (or any razors at all, but that's a different matter).

I find the best way to think about a honing steel is that you’re micro beveling the edge. [0] The images there help develop an intuition of what angle will work well. That said it may be irrelevant if your universal sharpener is doing the trick. :) [0] https://scienceofsharp.com/2018/08/22/what-does-steeling-do-part-1/amp…

Ceramic knives are so prone to chipping that they effectively have micro-serrated edges even when freshly sharpened. A micro-serrated edge on a razor pulls hairs and cuts skin. I don't doubt that in your experience ceramic knives cut food better than metal ones, but I suspect you have not used a well-sharpened knife. Mass-produced knives are typically sharpened using belt grinders and do not cut as effectively as knives hand-sharpened by someone skilled at it. https://scienceofsharp.com/2018/02/24/ceramic-blades/

For those interested in the SEM images and looking for more, check out this site: https://scienceofsharp.com/home/ The site focuses mainly on sharpening razor blades and is full of SEM images of blades in various conditions. Very cool to see. This page about burrs has some particularly cool images: https://scienceofsharp.com/2015/01/13/what-is-a-burr-part-2/

I think the trick with straight razors is to finish the blade with a denim strop with abrasive compound. I only have two stones, a 2k and a 5k. From there, I strop with a strip of denim that I put a little bit of automotive "swirl remover" (it's like car wax with a bit of abrasive in it, but the point is almost any kind of "polish" compound will work.) This blog describes why denim works so well: https://scienceofsharp.com/2016/04/14/simple-straight-razor-honing/

These ideas are mistaken. "Sharpness" is related to the physical size and radius of curvature of the apex of the blade, combined with the angle of the terminal bevel. [1][2][3] Chipping of any sort almost certainly tends to erode the sharpness for many reasons, not least of which is that a sharp edge is a very low entropy state (compared to a dulled / chipped / etc edge...). VG-10 steel is considered "entry level" in terms of high end steels. [4] It was first introduced in production knives in the mid-90s, almost thirty years ago! [5] And there has been significant progress in materials since then. Almost all mid- and high-end knives these days are cut from blanks via an industrial laser or waterjet cutter. ----- [1] https://scienceofsharp.com/2014/01/25/quantifying-sharp/ [2] https://scienceofsharp.com/2014/08/18/definitions-of-sharp-and-keen/ [3] https://scienceofsharp.com/2015/03/24/sharp-and-keen-part-2/ [4] https://www.bladehq.com/cat--Best-Knife-Steel-Guide--3368 [5] https://forum.spyderco.com/viewtopic.php?t=87185