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2. Knife sharpening - Wikipedia

   en.wikipedia.org/wiki/Knife_sharpening

   The shape near the edge can be highlighted by rotating the knife and watching changes in reflection. Nicks and rolled edges can also be seen, as the rolled edge provides a reflective surface, while a properly straightened edge will be invisible when viewed head-on. [4] Edge of a knife after sharpening and stropping.

3. Straight razor - Wikipedia

   en.wikipedia.org/wiki/Straight_razor

   The edge is delicate, and inexpert use may bend or fold over the razor's edge. To unfold and straighten the microscopic sharp edge, one must strop the blade on leather periodically. [ 52 ] A 1979 comparative study of straight and electric razors, performed by Dutch researchers, found that straight razors shave hair approximately 2/1000 in. (0 ...

4. Sharpening stone - Wikipedia

   en.wikipedia.org/wiki/Sharpening_stone

   Roughly sharpening a blunt edge 1000-2000: 8 μm: Fine, will leave a blade sharper than most factory edges 4,000: 4 μm: Ultra-fine, for cutting meat 8,000: 2 μm: Further smoothing a sharp edge for cutting fish or vegetables (sinews in meat will bend an edge this sharp) 10,000: 0.5 μm: Polishing an edge to a mirror-smooth (but possibly ...

5. Sharpening - Wikipedia

   en.wikipedia.org/wiki/Sharpening

   Video: Saw blade sharpening machine Edge/Apex of a knife after sharpening and stropping. Although this edge is sharp enough to bite a thumbnail, cut paper smoothly, or shave arm hair, the microscope plainly shows an edge which reflects light back into the lens. A truly sharp edge is too thin to reflect significant light.

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7. Grindstone - Wikipedia

   en.wikipedia.org/wiki/Grindstone

   The working edge of the hatchet or axe was sharpened by rubbing it against an abrasive stone, eventually leading to the creation of a shallow oval-shaped groove over time, [4] The grooves vary in length from 80 mm (3.1 in) up to 500 mm (20 in), and can be up to 200 mm (7.9 in) wide and 100 mm (3.9 in) deep. They are often found near water ...