The 0.5μm V2 stone works well.
You could say that after using the 1μm stone, the edge surface doesn’t improve much further, but the blade is still a tiny bit sharper.
The surface of S35VN steel after sharpening with Dr. Marv stones. Measured using a professional interferometer.
"The surface of the CPM S35VN steel after sharpening shows extremely low roughness — Sa ≈ 1.4 nm and Sq ≈ 1.9 nm, which is already approaching the smoothness of optically polished surfaces. For comparison, an iron atom has a diameter of approximately 0.25 nm, chromium around 0.26 nm, vanadium about 0.27 nm, and niobium roughly 0.29 nm, meaning that the average surface irregularities correspond to only a few atomic layers in height.
Sz ≈ 62 nm indicates that a few more pronounced local defects or deeper scratches are still present on the surface, but overall the texture is very homogeneous and fine. The interferometric map shows only faint traces of the sharpening direction and no significant surface damage. For knife steel finished on a sharpening stone, this is an exceptionally smooth and very well-refined edge surface."
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