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Thanks for all replies! Evaluating the shaving edge seems like a resonable approach :) Its been a while since i used the stone for a complete hone session. I'll do that and report the results.

Dont think its the nagura causing the yellow slurry, but the base stone. However, perhaps it is possible that the nagura particles abrade the iron oxide from the stone, or at least that would be...

Got if from a japanese auction site, and it was not alot of money, so i dont really feel that was a bad deal. In comparision to other stones it does not seem that soft, I have a simple test to...

Ok, thanks for the input. This is what the stone looks like after honing water only, hard to say if it slurry in there, but Im guessing most of the swarf comes from the blade, the water it self looks...

I need some help with this JNAT. Got it from Japan about a year ago, and did not really have any info on hardness etc when I decided to buy it. I thought that it looked very nice and that (due to the...