I read on the HI web site and saw the Kami's heat treating blades by pouring water over the cutting edge of the blade, watching the blade turn different colors as it cooled, looking for the right temperature to stop. I was just wondering if they ever water quench the cutting edge into a water medium. Also, do they ever try different quenching mediums, like oil? I am not questioning the quality of the treatment, just wondering if any Kami's work with any other mediums or methods?