Nubatama Bamboo Black 220 Grit. In this video I introduce a 220 grit Nubatama stone, This stone is being used on a 270 mm Tojiro gyuto which has been used roughly ("gone through hell") and has chips all along the edge, demonstrated by running your fingernail along the edge.
The stone is porous but saturates in just a couple minutes. Not very muddy. Dishes slowly. An aggressive cutter that produces a very good edge. A perfect stone for reestablishing coarse edge geometry quickly.
I demonstrate how to 'hear' when you are on the bevel that has already been established when the knife is already wet and you don't care to use a 'Sharpie' trick or marking the bevel with a sharpie to see where you are grinding to establish your sharpening angles.
I demonstrate the lack of necessity of generating hugh burrs and keeping the edge centered in the same place, taking off burr as you go back and forth from side to side. Removing this many large chips requires burr generation on both sides. This helps to preserve the original symmetry or asymmetry of the original edge grind.
I also demonstrate ambidextrous sharpening contrasted to right handed sharpening techniques. I discuss changing edge profile compared to evenly distributing wear along the length of the knife. Tip damage was particularly severe and this stone handled the knife's problems effortlessly.
Please let me know what you think of this stone as a future member of the Nubatama family of stones.