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2. Knife sharpening - Wikipedia

   en.wikipedia.org/wiki/Knife_sharpening

   Knife sharpening is the process of making a knife or similar tool sharp by grinding against a hard, rough surface, typically a stone, [1] or a flexible surface with hard particles, such as sandpaper. Additionally, a leather razor strop , or strop, is often used to straighten and polish an edge.

3. Scissor grinder - Wikipedia

   en.wikipedia.org/wiki/Scissor_grinder

   In the case of both knives and scissors, the blades wear out depending on the type and duration of use, in that the sharp edges are initially bent to the side in the minimal range during use, and subsequently torn out and become chipped, which makes recurring sharpening or re-sharpening necessary. This gave rise to the itinerant trade of the ...

4. The Best Two-Step Sharpeners for Keeping Your Knives Razor Sharp

   www.aol.com/news/best-two-step-sharpeners...

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5. Sharpness (cutting) - Wikipedia

   en.wikipedia.org/wiki/Sharpness_(cutting)

   Sharpened metal drop-point blade Naturally occurring sharp obsidian piece Shark tooth with a sharp, serrated edge A sewing needle comes to a sharp point. Sharpness refers to the ability of a blade, point, or cutting implement to cut through materials with minimal force, and can more specifically be defined as the capacity of a surface to initiate the cut. [1]

6. 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.

7. Ceramic knife - Wikipedia

   en.wikipedia.org/wiki/Ceramic_knife

   Unlike a steel blade that benefits from regular honing and resharpening in order to keep a sharp edge, a much harder ceramic blade will stay sharp and retain its cutting edge for much longer—at least ten times longer according to tests on a particular knife. [4] However, the hardness of the ceramic material also makes it difficult to ...