Aogami, also known as "blue paper," is a type of high-quality steel used primarily in the production of knives and other cutting tools. It is made from a blend of carbon steel and specific alloying elements, which enhance its hardness and edge retention. Aogami is favored by many artisans and chefs for its ability to take a sharp edge and maintain it over time. The term "Aogami" is often associated with traditional Japanese craftsmanship, particularly in the making of Japanese knives. This steel is produced by a few specialized manufacturers, such as Hitachi Metals, and is known for its distinctive blue color when treated. Aogami knives are highly regarded for their performance and durability in culinary applications.