柿渋 (Kakishibu)

Kanji Meaning
柿 (kaki) means “persimmon,” and 渋 (shibu) refers to astringency or tannin.
柿渋 describes a dye made from fermented unripe persimmons.

Historical Use

Kakishibu has been used in Japan for centuries as both a dye and a protective treatment. The tannins in fermented persimmon liquid were applied to cotton, hemp, paper, and wood to strengthen fibers and improve resistance to water and insects.

It was commonly used for workwear, fishing garments, bags, and utilitarian textiles where durability was important.

Appearance and Characteristics

Kakishibu produces tones ranging from light amber to deep brown, depending on concentration and exposure. The color deepens gradually over time through oxidation and sunlight.

Unlike synthetic dyes, kakishibu develops slowly. Continued exposure to air and light can shift the tone, creating subtle variation across the surface.

Material and Texture

Cotton or hemp treated with kakishibu often feels slightly firm at first due to the tannin content. With wear and movement, the fabric softens while maintaining structure.

Because the dye reacts to environment and light, slight variation in tone is natural. Changes over time are part of the material’s behavior rather than a defect.

When used in contemporary garments, kakishibu dyed fabric introduces depth of color, natural aging characteristics, and a finish rooted in functional craft tradition.