It seems the only “refillable ballpoints” I’ve ever come across are refilled using cartridges, but that seems kinda wasteful considering the cartridge itself isn’t recyclable or reusable. Bottle ink seems to be only used for fountain pens. Unless if I’m mistaken, why can’t ballpoints be refilled with ink? Is it not possible to take an ink syringe and bottled oil-based ink and use those to refill the cartridge?
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The ink paste is very thick and lasts a long time, which makes it cost-effective already. The syringe would have to be unclogged with acetone, and likely cause a mess that cost more to clean if you spill the ink on a table or clothes. It would also be challenging to fill the thin plastic tube without any air bubbles and without diluting the ink to a liquid state.
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