[Jean Thibodeau]

Greyson;

The bottom shadowed part of the blade gives us very little information that is a " positive " indication of the crosssection of that part of the blade: Just what in the picture looks like a flat uniform colour. The brain tends in a case like this to fill in the blank with it's own expectations. The dark part of the blade could be flat ground or hollow ground to an actual sharp edge or ending in a narrow flat.

The top " light " part has visual cues that give the feeling of being gently hollow ground: This leads me to see the dark part as also hollow ground for aesthetic reasons. All this said, sharp on both edges seem to me to be a coin toss.

In looking at this as a graphic artist and how I would draw this myself.

If I wanted to make it clear that there was a sharp hedge on the dark side I might just subtlety lighten the very edge even if in real life no light would be reflected. In art you sometime lie to tell the truth: It's not photography.