wiki-Urasuki

• Definition: A concave indentation formed on the back side (ura) of traditional Japanese single-bevel knives.
• Details: The urasuki reduces the surface area of the blade that comes into contact with food, lowering friction and resistance. This structural feature allows the knife to glide more smoothly through ingredients while also making it easier to sharpen and maintain the correct edge angle.
• Comparison: Western double-bevel knives typically have flat backs and rely on geometry for food release, whereas Japanese single-bevel knives use urasuki to enhance sharpness and control. Without urasuki, cutting performance decreases and sharpening becomes more challenging.
• Practical Use: Found in yanagiba, deba, and usuba knives, urasuki is essential for professional-level precision in slicing fish and vegetables. Proper urasuki ensures that food does not stick and that the edge can be sharpened effectively throughout the knife’s lifespan.

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Urasuki