Q. Is this the new version of the Naniwa Chosera stone?
A. Yes, Naniwa changed the name from Chosera to Professional stone. It has always been their professional quality stone, now its name reflects its intended use. The same method of production that has made this stone famous has merely been updated to allow for tighter standards in grit tolerances.
Q. Will I need a flattening stone for these?
A. Yes. Though the Naniwa Professional stones are harder and will wear more slowly than many other water stones, they still require flattening. Our favorite flattening stone is the DMT Dia-Flat 95 Lapping Plate. For information on how to flatten water stones, see our article How to Flatten a Waterstone.
Q. Will I need a stone holder to use these?
A. While a stone holder isn’t required, using one is a good idea. A stone holder will help keep the water stone from sliding around and will raise the stone up off the work surface, which can be especially handy when sharpening knives. Our favorite stone holder is the Universal Stone Holder.
Q. Do the colors of the stones correspond to the grits?
A. Yes. The photo shows the stones arranged by grit from 400 on the left to 10,000 on the right. So the 400 grit stone is light green, the 600 grit is blue, the 800 grit is red, the 1000 grit is bright green, the 2000 grit is mustard yellow, the 3000 grit is pink, the 5000 grit is gray, and the 10,000 grit is light blue.










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