Originally Posted by
Caledonian
Not everyone who can harden a knife blade correctly, can be counted on to do the same with a razor. The use of A-2, air hardened, is so attractive for avoiding distortion that it begs the question "Why aren't they all doing it?" ...
The best air-hardening comes from cold, moving air. It is sometimes hardened in oil...
... is the edge cracking with a sharp spink.
Japanese swords have a hamon pattern because they need the edge to be hard, but the body of the blade to be tough and resilient, and resist chopping, parrying and waving around. I can't see any functional reason for it in a razor.