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The use of slurry helps increase the cutting speed. There is no need for a shaving edge. You wash it off after, and use the stone with plain water or oil if it's not too hard to clean after, or...

It's a nice stone, and it seems to leave a nice polishing. Now all you have to do is, find the name of the indigenous people who lived there, name it after them, and you're good to go for selling...