The three things that matter in photography of edges

[Cyrano]

In the two years since I last posted in this thread, I've added a metallurgical microscope to my toolbox.

This is blade B, site 4:

• The upper portion of the image shows an undamaged region of the edge apex. The edge apex is convex (perhaps from honing?), with what appears to be residual burr.
  
• The lower portion of the image shows where the edge has been rolled over. The rolled region has been pushed towards the viewer.