Lapping Ohira stone

Hi all. Just thought i would pass along an observation about lapping one of my new Jnats.

It turns out that both the DMT 220 and mini 325 were leaving big scratches on this big, hard Ohira model 40 "Saikoukyu" from my local shop. I had the Norton 4/8 out to compare scratch patterns for my own comparisons, and it occurred to me to lap one with the other. To my surprise, the 4k side cut right through and left a smooth surface, reducing some high spots rather effortlessly, and leaving green mud on the white 4k stone. Perfect!

I tried the 8k side for final polishing, but it removed mostly 8k material, so I think the Ohira is simply harder.