They do in fact temper their blades. They just don't show it because it doesn't look good on tv. Just imagine that. I mean I guess they can talk a little about tempering it or cut to a short scene on the blades getting tempered but other than that, unless your actually physically tempering it with a torch or something, standing in front of an oven for an hour or so is kinda boring especially in filming it. Another note, this show is not an instructional knife/weapon making show. It's a show for entertainment. For instance the Food Network. Most of the shows don't even elaborate on the techniques of cooking. They just cook the xxxx dish and show you the end result. Some shows do in fact go into detail but those are the boring instructional stuff. Some people like that kind of thing and some don't. Of course us being the blacksmiths/bladesmiths etc. would love to watch a show that instructs in great detail what goes in to making stuff but that wouldn't appeal to everyone. Forged in fire is show is for everyone. Even my 80 year old Grandma loves the show and she knows nothing about blacksmith and such. It's entertainment! It's interesting! It's not an instructional show! So let this show open eyes in how cool, fun and interesting it is and then everything else falls into place. More and more people get curious and want to know more. It just sucks that a lot of people say, "wow they don't temper their blades? This show sucks! Dumpster diving for steel? This sucks! This sucks that sucks! Blah blah!" Be happy, be positive and don't hate.