Sailor Seiboku Dark Blue 50 ml Fountain Pen Ink
The Sailor Seiboku Dark Blue 50 ml Fountain Pen Ink is one of the most respected pigment inks in Sailor's catalogue. Developed using proprietary ultra-fine pigment particle technology, it combines excellent water resistance and long-term durability with a remarkably smooth writing experience. Its elegant dark blue colour offers a sophisticated alternative to permanent black inks, making it particularly popular among professionals, artists and fountain pen enthusiasts seeking permanence without sacrificing colour.
Sailor's Pigment Technology
Seiboku uses the same advanced ultra-fine pigment technology that has made Sailor's permanent inks famous worldwide. These exceptionally small pigment particles were developed to minimise the clogging issues traditionally associated with pigment inks while providing a writing experience remarkably similar to that of a dye-based ink.
As a result, Seiboku delivers smooth ink flow, excellent reliability and comfortable writing performance even in fine Japanese nibs. It is a permanent fountain pen ink designed to combine durability with everyday usability.
An Elegant and Permanent Dark Blue
Seiboku stands out for its deep and sophisticated dark blue colour. The ink offers excellent readability while providing more character and visual richness than a conventional blue ink. Its refined tone makes it suitable for professional documents, journals, correspondence, note-taking and creative work alike.
Once dry on paper, Seiboku exhibits excellent water resistance and outstanding long-term stability. These qualities make it particularly suitable for archival writing, important documents, personal records and manuscripts intended to remain legible for many years.
Resistance, Precision and Versatility
Sailor also highlights Seiboku's low tendency to bleed through paper and its resistance to show-through. This allows the ink to perform well on a wide range of papers and makes it particularly attractive for writers, illustrators and artists.
Its relatively fast drying time helps minimise smudging during everyday writing, while the depth of colour provides clean, precise and highly readable lines for both writing and drawing.
Recommended Papers
To fully appreciate the dark blue tones of Seiboku, we recommend using high-quality Japanese papers such as the Midori Cotton Pad A5 Blank or the Life Ginkouka Paper Pad. These papers showcase the ink's colour depth, line definition and permanent properties particularly well.
Frequently Asked Questions
Is this ink suitable for fountain pens?
Yes. Seiboku is specifically formulated for fountain pens.
Is it waterproof?
Yes. Once dry, Seiboku offers excellent water resistance and fade resistance.
Can it be used for important documents?
Yes. Its permanence and stability make it an excellent choice for documents, archives and long-term preservation.
Is it suitable for illustration?
Yes. Its water resistance, precision and low bleed-through make it popular among illustrators and artists.
Package Contents
The product includes a 50 ml bottle of Sailor Seiboku ink presented in an official Sailor cardboard box. (Product photographs are for reference only and slight variations may exist between images and the actual product.)
Technical Specifications
• Brand: Sailor
• Model: Seiboku
• Colour: Dark Blue
• Volume: 50 ml
• Ink type: permanent pigment fountain pen ink
• Technology: ultra-fine pigment particles
• Water resistance: water resistant once dry
• Bottle dimensions: 53 × 44 × 70 mm
• Approximate weight: 203 g
• Packaging: official Sailor cardboard box
• Box dimensions: 55 × 47 × 76 mm
• Product code: 13-2002-242
• EAN/JAN: 4901680184515
Why Choose Sailor Seiboku?
Seiboku offers a rare combination of permanence, durability and colour sophistication. Compared with traditional permanent black inks, it provides a rich dark blue tone that remains highly readable while adding personality and elegance to the written page.
At Inktraveler, we find Seiboku particularly interesting for users seeking a water-resistant ink that moves beyond standard black while maintaining professionalism and excellent readability.
The Sailor Philosophy
Founded in Hiroshima in 1911, Sailor is one of Japan's most respected names in the world of writing instruments. For more than a century, the company has developed fountain pens, nibs and inks recognised internationally for their quality, precision and innovation.
Sailor's permanent pigment ink series reflects this commitment to continuous improvement, combining archival durability with an enjoyable writing experience for writers, professionals and artists alike.
"Some colours preserve elegance even when words are meant to last forever."
Anon
Perfect ink for documentation that must stand the test of time. Lovely color and attributes.