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Sargasso Sea
A UK ink maker (est. 1864) known for an enormous range (150+ shades) at accessible prices, including several shading and sheening standouts.
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Paper & pairing
Blues and navies are the most broadly "safe" fountain pen colors: legible, professional, and unlikely to raise eyebrows in an office. Sheening inks need the right conditions to show off: a wetter nib and a coated, less-absorbent paper (Tomoe River and similar sheets are the community standard) let the ink pool slightly and separate into its second color as it dries. On cheaper, more absorbent paper the sheen effect will mostly disappear.
About Diamine
Founded in Liverpool in 1864, Diamine is one of the UK's oldest ink makers, known today for an unusually large range (150+ colors) at accessible prices.
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
Similar shades By colour distance
Color shown is a close digital approximation of a typical swatch, not a calibrated color match.