Originally Posted by
Vasilis
I don't think these lines are unique on Okudo stones. I have seen them on Shinden, Ohira, and others as well. Mostly Ohira. From what I understand, it depends on the depth the stone comes from; the deeper, the more likely to have these lines, or something along these lines, again, I'm far from expert, I'm writing what I've read and observed.
By the way, does anyone have a habutae suita? I would like to see photos of these, they are the top of the top, again from what I have read.
Rusen, like every single natural stone, all are unique, the color does not make it faster or slower. A yellow can be faster than a white. But a soft one will probably be faster than a harder, same "type of strata" from the same quarry, no slurry.