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TWSBI

Sapphire Blue

Blues & navies#3650A1

TWSBI's own ink line is formulated and bottled to pair with its piston-fill demonstrator pens.

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Specs

Color familyBlues & navies
Approx. hex#3650A1
SheenNot typically noted
BrandTWSBI

Paper & pairing

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.

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About TWSBI

Founded in 2009 by Ta Shin Precision, a Taiwanese manufacturer with over 50 years of plastics and metals experience, TWSBI's first pen, the Diamond 530, introduced an affordable piston-fill demonstrator that reshaped the entry-level market.

Taiwan Founded 2009
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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 Sapphire Blue?
Sapphire Blue falls into Inktend's blues & navies family based on its typical swatch color.
Does Sapphire Blue have sheen?
Sapphire Blue 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 Sapphire Blue?
Years, easily, as long as it stays capped and out of direct sunlight. The thing that actually shortens an ink's usable life is sitting unused inside a pen, not sitting on a shelf.
What paper works best with Sapphire Blue?
It behaves predictably on most fountain-pen-friendly paper. Stick to something reasonably absorbent-resistant, since cheap copier paper dulls saturation and can feather.

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Color shown is a close digital approximation of a typical swatch, not a calibrated color match.