Black Tunnel Tunnel

This is a black color dyed by iron mordant dyeing from roasted acorn nuts. According to ancient clothing ordinances, it was used as a color for house servants, but in the Heian period (794-1185), the black-rubber robe appeared in the Pillow Book, Izumishikibu Diary, and Tale of Genji as a symbol of authority to adorn the morning clothes of high-ranking officials.