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I'll try to remember when I'm back home Friday. At the moment I'm 2 hours from home for work training, so I've got limited access to that sort of thing.

Edit: or I could do some digging through...

So, an Arkansas stone is different from most others in that it doesn't really release grit to do the cutting, the silica creates a hard, fine-tooth that skims metal off the blade's surface. The idea...

To expand on this, regardless of the stone's color Novaculite - an Arkansas sharpening stone - is %99 pure silica. Which is a very hard substance, and the difference between soft, hard, true hard is...