Why do fountain pens and rollerballs often require priming or cleaning if left unused, unlike ballpoints?

Answer

They rely on water-based ink that can dry out inside the feed or cartridge.

Fountain pens and rollerballs use water-based inks which are prone to drying out in the pen's delivery system if left unused for too long, whereas the ballpoint's oil-based ink resists this issue.

Why do fountain pens and rollerballs often require priming or cleaning if left unused, unlike ballpoints?

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