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2. 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]

3. Straight razor - Wikipedia

   en.wikipedia.org/wiki/Straight_razor

   There is a tradeoff between stability and long term blade sharpness. A full hollow ground (1 ⁄ 1) blade can keep a very sharp edge even after a great number of honing cycles because of its high degree of hollowness but it is more susceptible to torsional bending because it is thinner. [38]

4. Knife sharpening - Wikipedia

   en.wikipedia.org/wiki/Knife_sharpening

   The angle between the blade and the stone is the edge angle – the angle from the vertical to one of the knife edges, and equals the angle at which the blade is held. The total angle from one side to the other is called the included angle – on a symmetric double-ground edge (a wedge shape), the angle from one edge to the other is thus twice ...

5. Macuahuitl - Wikipedia

   en.wikipedia.org/wiki/Macuahuitl

   A macuahuitl ([maːˈkʷawit͡ɬ]) is a weapon, a wooden sword with several embedded obsidian blades. The name is derived from the Nahuatl language and means "hand-wood". [2] Its sides are embedded with prismatic blades traditionally made from obsidian, which is capable of producing an edge sharper than high quality steel razor blades. The ...

6. Razor - Wikipedia

   en.wikipedia.org/wiki/Razor

   A modern double-edge safety razor and blade. The term safety razor was first used in 1880 [15] and described a basic razor with a handle attached to a head where a removable blade may be placed. The edge was then protected by a comb patterned on the head to protect the skin. In the more modern-day produced safety razors, the comb is now more ...

7. List of blade materials - Wikipedia

   en.wikipedia.org/wiki/List_of_blade_materials

   The blade is made of non-rustproof carbon steel, blue-plastered by hand and finely forged from the base to the tip of the knife. The 90 mm (3.5 in) long blade shows patina (dark spots) caused by decades of use. It can easily be sharpened to a shaving sharp edge. Carbon steel is a popular choice for rough-use knives and cheaper options.