kakishibu; astringent persimmon juice
A traditional Japanese liquid made from unripe astringent persimmons, used as a dye, wood preservative, and paper treatment.
Cloth dyed with kakishibu takes on a distinctive hue.
This Japanese paper has been coated with kakishibu to increase its strength.
Compound of 柿 (kaki, 'persimmon') and 渋 (shibu, 'astringency'), referring to the tannin-rich juice of unripe persimmons.