And before there was steel, there was stone. Cutting instruments are among the earliest of man's tools that we can recognize today. Stone knives served us for many thousands of years and actually work pretty well. A knife made from obsidian 9volcanic glass) is actually theoretically sharper than any steel. The cutting edge is fashioned by striking the rock in the right manner and splitting off a flake. The edge formed in this manner is comprised of the smallest possible component of the obsidian and is more than razor sharp. But it i also extremely fragile and dull rapidly.

When you investigate an archaeological site where obsidian is used, you find many of the discarded flakes - edge retouch flakes - as sharpening is a never-ending process. You are better off with 440HC....

Enough of these cutting remarks.