Quite an old thread on B&B which I thought was interesting.
https://www.badgerandblade.com/forum/threads/scanning-electron-microscope-blade-edge-images.386550/
(Not a fan of that forum usually)
https://www.badgerandblade.com/forum/threads/scanning-electron-microscope-blade-edge-images.386550/
(Not a fan of that forum usually)