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Wow...

I have a Lile Hard Black Ark and it is glass smooth. Far smoother than the Norton 8k and it leaves a super smooth finish too. I think I need to do some more research. I thought it was...

Not sure who you are responding to.. but if it is me.. I implying that either were sharper or shinier. My observation is that the Black Ark looks to be closer to or above the 8k.. By visual...

So based on the info in this link, the Black Hard Ark is about the same in the progression as a Norton 4k? Visual inspection of an edge after a few passes on a Hard Black Ark put it above the 8k.. ...

I've been successfully using a Hard Black Ark.. I'vd used oil, water and water/soap. The oil is a bit messy, while the latter two work well to modulate the grit.. water alone is slightly more...