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The Deep
Capybara is one of the 713 brands in Inktend's built-in ink catalog.
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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. 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.
About Capybara
Capybara is not a conventional commercial ink company but a small collection of hand-mixed inks documented by the Fountain Pen Pharmacist blog in April 2020. The reviewer described the colours as "mixed-by-hand" inks sent by an online friend that "don't have a company label", grouped for convenience under the name Capybara. The eight known shades (including The Deep, Loch Ness, Sylvan Mystery and Rose of Sharon) survive in collector databases from those reviews.
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.