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Backed edge bladelets are particularly abundant at a site in France that preserves habitation from the late Magdalenian – the Pincevent.

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Outdoor utility knives typically feature sturdy blades from four to six inches in length, with edge geometry designed to resist chipping and breakage.

Such blades were reputed to be not only tough and resistant to shattering, but capable of being honed to a sharp and resilient edge.

Similarly, prehistoric obsidian blades should have lost their edge ; this is not observed either ( although obsidian may have a different viscosity from window glass ).

High carbon stainless steel blades do not discolor or stain, and maintain a sharp edge.

Ceramic blades are hard, brittle, and lightweight: they may maintain a sharp edge for years with no maintenance at all, but are as fragile as glass and will break if dropped on a hard surface.

Flat ground blades have a profile that tapers from the thick spine to the sharp edge in a straight or convex line.

The resulting blade has a thinner edge, so it may have better cutting ability for shallow cuts, but it is lighter and less durable than flat ground blades and will tend to bind in deep cuts.

Serrated blades are more well suited for tasks that require aggressive ' sawing ' motions, whereas plain edge blades are better suited for tasks that require push-through cuts ( e. g., shaving, chopping, slicing ).

There are fewer types of these blades, and may be divided into those where the entire edge is rounded and those where only a part is rounded, or even straight.

Solutrean backed edge blades display pronounced and abrupt retouching, so that they are long and narrow and, although rare, characterize certain phases of the Solutrean period.

In all these locations, the microliths found have been backed edge blades, tips and crude flakes.

Though not approved by the US Food and Drug Administration ( FDA ) for use on humans, obsidian is used by some surgeons for scalpel blades, as well-crafted obsidian blades have a cutting edge many times sharper than high-quality steel surgical scalpels, the cutting edge of the blade being only about 3 nanometers thick.

It is also used to repair small nicks in the leading edge of composite propeller blades on light aircraft.

Japanese blades, however, typically have their sharp cutting edge protected by a wooden scabbard called a saya.

Here are two Japanese sword nakago ( tang ), the top one is from a katana, the bottom is from a tachi, you can see the difference in the placement of the mei ( signature ), if you follow the curve of the blades you can see that if the tachi was worn tachi style with the cutting edge down the mei would be pointing away from the wearer and if the katana was worn with the cutting edge up in katana style the katana mei would also be pointing away from the wearer.

Lenticular blades are shaped like thin doubly convex lenses, providing adequate thickness for strength in the center while allowing a proper cutting edge.

Freshly cut blades are always used since the sharpness of the edge is very great.

Dao blades are moderately curved and single-edged, though often with few inches of the back edge sharpened as well ; the moderate curve allows them to be reasonably effective in the thrust.

However, if properly protected and maintained, these blades can usually hold an edge for long periods of time, even after slicing through bone and flesh, or heavily matted bamboo to simulate cutting through body parts, as is in iaido.