Use this fine grit stone after sharpening with a coarse and medium grit to remove any scratches on the surface or to simply realign a slightly dull edge for a razor sharp finish. Using a fine grit stone to polish your edge can actually help to make carbon steel knives more rust proof. This stone is composed of synthetic and natural stone from Kyoto, so you'll feel the softness of a natural stone without worrying about inconsistent grit sizes. Start with a generous amount of water over the stone and finish by pressing your blade lightly in the slurry. The particles in the slurry act as a buffer to polish your blade. The nagura or buffer stone that is included with this stone will also help you create a slurry that aids with sharpening and polishing. Soak before use (until the bubbles stop surfacing)