The use and disappearance of vegetal fibres in clay–sand mixtures in furnace walls in pre-seventeenth-century iron smelting sites in the Chūgoku region (Japan)

Abstract

This paper investigates the importance of the presence of vegetal fibres within clay–sand mixtures in Japanese furnace walls in iron smelting sites in the Chūgoku region during the antique and medieval periods. This presence is all the more interesting as these fibres disappeared with the advent of tatara, the traditional Japanese iron smelting process, at the beginning of the seventeenth century. Understanding this disappearance is a major challenge in the study of the evolution of iron reduction in Japan. The data from archaeological excavations, despite a few scattered clues, are not yet able to give us a sufficiently clear picture of the presence or absence of these fibres in the clay–sand mixture that makes up the furnace walls. Therefore this study highlights the need for systematic research by the creation of a database combined with further analyses and experiments to understand the role fibres might have had in the iron smelting process and why they disappeared from the tatara process in Japan.