Posted By: DaveI bought this for taking to work (when I'm allowed to go back to work). It is VERY reactive. However, this this also a great knife for experimentation with forcing a patina and learning sharpening.
It came reasonably sharp, but was fun to sharpen - and practice sharpening on. It reacts QUICKLY to standing water. I found that cleaning with Barkeeper's Friend removes most of the korouchi finish - but still leaves a lot of character.
I went ahead and did a forced patina with mustard/apple cider vinegar mix (left it on for about 16 hours or so) and it came away MUCH less reactive, and with cool grey/gold patina - depending on the light.
It works fine for what it's designed for, but for me, this has become the ULTIMATE cheese knife. I'm 100% serious. This knife cuts through hard cheeses better than anything else I've ever used. It's worth it for this task alone.
Also, the handles are BEAUTIFUL and smooth. Great figuring in the wood, and have a combination shape of half-hexagon on top (palm side), and oval on the bottom (finger side). Super comfortable.
I'm definitely buying another one for work, as the one I have now is staying at home for cheese duty.
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