Is there a difference between the sides of the Naniwa 12000 stone? One side seems to be a little more coarse than the other. Just wondering...
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No differenc in the composition. Might be a difference in the surface finish from the manufacturing process, but you will be lapping it before use, anyway. Just pick a side to be the top and lap that side only. You should see a label stamped along the edge. I orient mine so that it is upside up but it really doesn't matter.