economical! 36

Little comparison: I use a simple plastic fountain pen of a great French brand known ... that I filled with red ink (using a piston recharge) to correct the copies of my dear heads blondes, brunettes etc ...
between the bottle 10 including postage, which lasts from me ... close to 3 years or more; and a small box of 6 small cartridges to over 2 the box ... I chose the first solution! economy as ... and plastic, when one considers the amount of cartridges required for the equivalent in bottles. I will not even mention the amount of non-disposable pens thrown!
Okay, sometimes I just work my fingers recharging, but it is when I'm tired so awkward ...
Piston refills are sometimes provided with the pen, if not frankly it's not expensive and it's good for our poor planet ... our poor wallet!