Inktend / Ink library / Sei-boku
Sailor
Sei-boku
Blues & navies
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A Japanese ink house whose bottled inks are formulated for their own fine, precise nibs, with several well-known sheening colors in the lineup.
Specs
Color familyBlues & navies
Approx. hex#2E4E6E
SheenNot typically noted
BrandSailor
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About Sailor
Founded in Hiroshima in 1911, Sailor is Japan's oldest fountain pen maker, known for precisely ground gold nibs and its own line of bottled inks.
Japan
Founded 1911
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Paper & pairing notes
Blues and navies are the most broadly "safe" fountain pen colors — legible, professional, and unlikely to raise eyebrows in an office. This ink will behave predictably on most fountain-pen-friendly paper. Cheap, highly absorbent paper (standard copier paper) will dull any ink's saturation and can cause feathering or bleed-through with wetter nibs.
Storing and using the bottle
Bottled fountain pen ink has an effectively long shelf life when kept capped and out of direct sunlight — most inks remain usable for years. The main risk isn't the ink spoiling, it's a pen sitting inked and unused for weeks: that's what causes clogs, not the ink's age.
Frequently asked questions
What color family is Sei-boku?
Sei-boku falls into Inktend's blues & navies family based on its typical swatch color.
Does Sei-boku have sheen?
Sei-boku is not typically noted for sheen. If you want that effect, browse similarly colored inks tagged with sheen in the ink library.
How should I store a bottle of Sei-boku?
Bottled fountain pen ink has an effectively long shelf life when kept capped and out of direct sunlight — most inks remain usable for years. The main risk isn't the ink spoiling, it's a pen sitting inked and unused for weeks: that's what causes clogs, not the ink's age.
What paper works best with Sei-boku?
Blues and navies are the most broadly "safe" fountain pen colors — legible, professional, and unlikely to raise eyebrows in an office. This ink will behave predictably on most fountain-pen-friendly paper. Cheap, highly absorbent paper (standard copier paper) will dull any ink's saturation and can cause feathering or bleed-through with wetter nibs.
Similar shades
Color shown is a close digital approximation of a typical swatch, not a calibrated color match.