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Here's my thread on the toxic inclusions: http://straightrazorpalace.com/hones/125902-my-first-jnat.html#post1601266

Yes, it's a tomo nagura. Work a slurry about the consistency of 2% milk and watch the color. When it starts to darken, check your edge and replace the slurry if it needs more sharpening. When...

That's what Maksim has been selling as tomo for a while now - very fine, yellowish slurry, distinct muddy odor. Very nice stone. I use it on all my toishi with excellent results.