Comment by tim333 4 hours ago I guess that before metal working, obsidian would have been the best knife edge available. 2 comments tim333 Reply caymanjim 3 hours ago It's a far, far better knife edge than metal even now. It's used in some specialized scalpels. It's just fragile.
caymanjim 3 hours ago It's a far, far better knife edge than metal even now. It's used in some specialized scalpels. It's just fragile.
It's a far, far better knife edge than metal even now. It's used in some specialized scalpels. It's just fragile.