In the Japanese Way of Tea, iron kettles are used to boil water for preparing the tea. In Japan, the history of iron kettle casting using sand molds can be traced back to the Heian and Kamakura periods.
If you break down the process of producing a kettle into precise detail, it can easily involve more than 100 individual steps and is an undertaking that requires time and patience.
When the outer mold and inner mold are ready, it is time for the casting step. Molten iron heated to 1400°C is poured into the mold.