Collection: Antique Ink Sticks (Koboku / Vintage Sumi Ink)

KOBOKU

The Essence of Ink, Deepened and Refined Through Time

It is often said that sumi ink becomes more beautiful as it ages. Freshly made ink sticks and aged ink sticks (Koboku) each have their own distinctive qualities. New ink—especially when made from high-grade soot and premium glue—tends to have more gloss and stickiness.

As decades pass, the glue (which is the source of stickiness) gradually settles and stabilizes. This natural aging process produces ink that is smoother on the brush, softer in texture, and capable of expressing subtle, elegant tonal variations. Because of this refined character and rarity, Koboku has long been treasured by master calligraphers and collectors.

At Shoyu Online, we offer carefully preserved Koboku, Senjuboku, and Hyakusenboku from renowned makers such as Kobaien, Bokuundo, and Kuretake. All items have been stored under ideal conditions by the manufacturers, ensuring their quality and authenticity, so you can purchase with confidence.

We invite you to experience the depth, richness, and unmatched beauty of aged sumi at least once. Please note that many items are available only in very limited quantities and will no longer be restocked once sold out.

Choose by Type of KobokuKOBOKU Category

Here you can explore the different varieties of Koboku available at Shoyu Online. Some are extremely limited and highly valuable. Please select the type that best suits your needs and artistic preferences.

SeibokuSEIBOKU

Choose Koboku by Production EraKOBOKU SEIZO NENDAI Category

Koboku categorized by the decade of production.

Produced in the 1960s1960's