Читаем и запоминаем: Tamahagane is made of an iron sand (satetsu) found in Shimane, Japan. There are two main types of iron sands: akame satetsu (赤目砂鉄) and masa satetsu (真砂砂鉄). Akame is lower quality, masa is better quality. The 'murage' decides the amount of the mixing parts. Depending on the desired result, the murage mixes one or more types of sands.