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Japanese sword blade and sharpening stone and water bucket at 2008 Cherry Blossom Festival, Seattle Center, Seattle, Washington. Sword polishing is part of Japanese swordsmithing where a blade is polished after forging. It gives the shining appearance and beauty to the sword.
The Japanese traditionally use natural sharpening stones (referred to as tennen toishi [14]) wetted with water, as using oil on such a stone reduces its effectiveness. The geology of Japan provided a type of stone which consists of fine silicate particles in a clay matrix, somewhat softer than novaculite . [ 15 ]
Diamond stones can be useful in the sharpening process. Diamond is the hardest naturally occurring substance known and as such can be used to sharpen almost any material. [8] (Coarse diamond sharpening stones can be used for flattening waterstones. [8] [9]) Alternatively, tungsten carbide blades can be used in knife sharpening. A clamp-on knife ...
The substance on the sharpening surface must be harder (hardness is measured on the Mohs scale) than the material being sharpened; diamond is extremely hard, making diamond dust very effective for sharpening, though expensive; less costly, but less hard, abrasives are available, such as synthetic and natural Japanese water-stones. Several ...
Japanese sword blade, sharpening stone, and water bucket at the 2008 Cherry Blossom Festival, Seattle Center, Seattle, Washington Further information: Japanese sword polishing When the rough blade is completed, the swordsmith turns the blade over to a polisher ( togishi ) whose job is to refine the shape of a blade and improve its aesthetic value.
Arkansas and Japanese stones are both rare and expensive now, but this depends on their grade. It's the hardest Arkansas and the sword polishing (not sharpening) stones that are becoming the most scarce. The quarries are still there and full of the lower-grade stone, but the limited areas for the high-grade are working out.
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