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Obsidian knives are known for their exceptional sharpness. Obsidian is a naturally occurring volcanic glass that can be honed to an incredibly thin and sharp edge. When fractured, obsidian can form blades with cutting edges that are finer than even the sharpest steel blades.

However, it's worth noting that the concept of sharpness can vary depending on the context and the specific application. While obsidian knives are renowned for their sharpness in terms of their ability to achieve a fine edge, there are other materials that can rival or even surpass obsidian in certain aspects.

For example, advanced high-carbon stainless steel alloys used in modern surgical scalpels, razor blades, or high-quality kitchen knives can achieve exceptional sharpness and edge retention. These materials undergo rigorous manufacturing processes and can be engineered to achieve remarkable cutting performance.

Furthermore, there are synthetic materials such as ceramic knives that can also achieve remarkable sharpness. Ceramic blades can be extremely hard and maintain their edge for a prolonged period. However, they are also more brittle compared to steel or obsidian, making them more prone to chipping or breaking if used improperly.

Ultimately, the sharpness of a knife depends on various factors, including the material it is made of, the manufacturing process, and the specific requirements of its intended use. Different materials and designs excel in different areas, so there isn't a single answer to what is definitively the sharpest knife.

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