(doesn't have anything to do with TQ)
I've never watched a 47 minute YouTube video before until this one.. still, it's long so i tried to break it down:
3:20 - preparing the metal
12:45 - forging the sword
24:55 - polishing the sword
31:00 - Japanese katana vs European broadsword
33:35 - modern samurai schools
39:45 - sword vs bow
42:02 - mass-produced inferior katanas
but it's good enough that i suggest watching the whole vid
too bad the ancient way of testing it is gone now: using it in battlefield
dem guns