Some microtome blades are glasses. Like the obsidian blades the Aztecs used with much thinner edges than steel.
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1 year ago
Knife sharpening and diamond steel
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1 year ago
Also for more specialized cuts. AFAIK japanese fish knives as used in the making of sushi are one-sided, also so vegetable knives. This is so that one side remains flat and true against the slicee, while the beveled edge shaves off a thin bit. Two-sided, i.e. wedge-shaped knives are used for things like splitting a pumpkin, where the one-sided blade would run out to one side...
Thomas Prufer