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A coticule is a finishing or polishing stone, the penultimate step in a sharpening process before stropping. It would take for ever to sharpen a dull knife on such a stone.

The 10000k stone sold by axminster for £37 is supposedly the same as the kitayama 12k (sometimes this same stone sold as 8K) as they are both made by matsunaga, who also make the sun tiger and king...