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Normally, slate hones need to be used with some type of lubricant. Perhaps by mixing the slurry with oil, the oil coats the abrasive particles and provides the lubrication needed.

Interesting...

I had not thought about the cushioning aspect of the leather. Perhaps the embedded particles sharpen just like the particles embedded in the stone itself would do.

When people create slurry on a hone like the Guangxi, they do so because the slurry helps the hone cut faster. If you want to get the finest edge possible from a hone, you start with slurry and then...