鉄漿
also: てっしょう
Meanings
1
tooth-blackening dye
historical term
Historical term for the dark dye used in the custom of ohaguro (tooth blackening), common in Japan until the Meiji era. The reading かね is the most common.
Women in the Edo period applied tooth-blackening dye as a sign of marriage.
I saw an exhibit at the museum on how tooth-blackening dye was made.