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Kiwa-Guro Black is one of Sailor’s “luxury” inks, more costly than their standard Jentle line. This is one of Sailor’s two pigmented inks, made with ‘nanoparticles’ – they also make a blue-black called Sei-Boku.
Pigmented inks are different from dye-based inks (most other fountain pen inks) in that they are made with micro-fine pigments suspended in the liquid to give the ink its colour. In order to make these safe for fountain pens – to prevent persistent clogging or flow issues – these particles are really micro-fine, and the inks are designed for fountain pen use.
Be careful not to mix these up with the inks that are not okay for fountain pens – India ink, calligraphy ink (thicker, to hold a little better to dip pens) or inks that have shellac in them. These inks will definitely clog up your fountain pen’s feed, and may even cause more…
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