Next Up! Dan's Chef Knife Commission Part 5: Joining Bolster, Blade, & Handle.

Dan's Bohler Uddeholm 390 blade is then wrapped in stainless steel foil to protect the steel from oxidization during heat treating. The blade is then heat cycled to 1150 degrees C, much higher than other steels! Dan's blade is then quickly quenched using aluminum plates to ambient temperature. At this point the blade is dead hard and needs to be tempered for a few hours at a designated temperature to bring the blade to the proper hardness.

Here is the blade after the foil was ...