Tamahagane is a traditional Japanese steel made from iron sand, known for its high quality and unique properties. It is produced through a smelting process in a clay furnace called a tatara, where iron sand is heated with charcoal. This method allows for the creation of steel with varying carbon content, which is essential for crafting strong and durable blades. Historically, tamahagane has been used to make katana, the iconic Japanese swords. The steel's purity and ability to be forged into a sharp edge make it highly sought after by swordsmiths. The craftsmanship involved in creating tamahagane contributes to its cultural significance in Japan.