The simplest method of hardening steel to diamond hardness
As you know, steel can be made so hard by special hardening that it will cut glass, like diamond. But not everyone knows that to give steel such hardness there is a very simple way. Awl, knife blade or other tool should be heated to a bright red glow and immediately immersed in ordinary sealing wax for one second only. The operation of immersion in sealing wax must be repeated several times, choosing a fresh place for sealing each time for immersion until the steel cools down and no longer enters the sealing wax. Then the hardening process is considered complete. It remains to clear the adhering particles of sealing wax. When using a steel tip hardened in this way or a blade, it is recommended to moisten it with turpentine each time.