Quote Originally Posted by mainaman View Post
Nice resource
I wonder about the J-nat slurry though. The shape of the particles is weird, I took images of slurry a few years a go and it looks a bit different.

you can see the layered structure of the slurry and the theory is that that is where the break down occurs with honing.

His description of the slurry getting black with metal swarf is also not very consistent with a finishing stone. Those usually do not abrade so much as to darken the slurry significantly.

Any way there is no hard evidence that I know of what happens really with the slurry.
He also referred to the Nakayama Asagi (the source of the analyzed slurry) as having a "red-orange colour." That seems odd.