With these stones I would suggest purchasing from a vendor that can ensure that the stone in question is a Razor grade stone regardless of the quarry location or stamping. The real learning curve with these stones is honestly managing the slurry. If you start out with a medium heavy slurry and you work that down to water through a dilution you may find that you need to go back and repeat that to some degree. Then it’s a matter of deciding how much slurry you wanna start with on round two for example. You might only want to start out with about half the amount of slurry (or perhaps less) on round two. So developing fundamental skills with these stones doesn’t necessarily resemble the same approach you might use with synthetics.
Then there’s the consideration of using Asano stamped Mikawa Nagura as well.
Then there’s the consideration of using Asano stamped Mikawa Nagura as well.