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Well I tried the PHIG last night as I had it out to finish a couple three Heljies so after I was done with them, I tried working up a slurry but I noticed the Grey from the PHIG in with Nagura slurry...

LOL I found the exact same ratio I kept 1 outta 4

I later found the Hard scratchy ones could be polished and used like an oil (Using something slick) stone with decent results..

Great minds and all that I was thinking a bit after posting this and was thinking along the same lines as Bill's post on the combination of the slurry..
This has often been the reason given, for why...

I know I have read about some experiments done in the distant past but I was thinking as I unpacked a set of Nagura yesterday.

And having followed a couple of recent threads in the Hone/Honing...