In all reality, honestly. I thought it a thread on rust bluing blades. A very tedious and time consuming process not without great benefits over other conventional bluing processes, especially band-aid cold bluing. Hot bluing would be rather labor intensive considering dismantling a Khukri to do so properly. From his initial pictures, I thought this the direction SG was taking, a great start with no pitting due to the frigid temperatures. My approach may have been different but, the results may have been similar if continued. While not a stranger to the process, I've never done much more than a Luger or Mauser parts. The idea of an entire blade has me thinking. Perhaps this is how B'man does his, I'm not sure. We've never discussed it nor am I lucky enough to have acquired any of his highly respected work.