Extreme sharpness: What a Japanese blade is capable of

This video demonstrates the legendary sharpness of the Japanese blade. The creator of the video conducts a visual test, cutting through soft tomatoes with virtually no effort—the blade passes through them as if through air. Viewers can see the results of the master's painstaking sharpening, transforming the metal into an incredibly dangerous and precise tool. The video sparks lively debate about whether such sharpness is a practical necessity or merely a demonstration of the perfection of steel-processing technology.

Almost any high-quality carbon steel blade can be sharpened to this degree with the appropriate skill and a set of specialized stones. Commenters note that the famous katana is essentially a type of sabre, not a sword in the classical European sense. Some viewers doubt the authenticity of the action, suggesting the use of special effects or unusual tabletop materials (such as rubber), due to the distinctive sound of the impact.