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Japanese knives made of rare steel are typically crafted using traditional methods that have been refined over centuries. One of the most highly regarded types of steel used in Japanese knife-making is called Tamahagane, which is made from iron sand and charcoal.

To create Tamahagane, black sand is first collected from rivers and beaches and then smelted in a clay furnace with charcoal. The furnace is heated to a high temperature for several days, during which time impurities are burned away and the iron sand is transformed into a high-quality steel.

Once the steel is ready, the bladesmith will then begin the process of forging the knife. This involves heating the steel to a high temperature and then hammering and shaping it into the desired shape using a combination of traditional hand tools and techniques.

After the blade has been forged, it will then undergo a process of tempering, which involves heating it to a specific temperature and then rapidly cooling it in water or oil. This process helps to create a hard, durable blade that is able to hold a sharp edge.

Finally, the blade is polished and sharpened using a series of specialized tools to give it a razor-sharp edge. The end result is a beautifully crafted knife that is not only highly functional but also a work of art in its own right.

Overall, the process of making Japanese knives from rare steel is a complex and highly skilled art that requires years of training and experience to master. But the end result is a knife that is both beautiful and highly effective, and which reflects the deep cultural traditions and craftsmanship of Japan.