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First, they all use water soluble, water based inks (you can ruin a fountain pen by filling it with the wrong ink). breitling chronomat b01 42 Second, they all have a reservoir for the ink, which can be the barrel of the pen itself, or a flexible rubber sac; nowadays the majority of fountain pens use disposable ink cartridges (which purist pen enthusiasts domino’s pizza rolex tend to look down on a bit).