Dip Pens are certainly not cartridge fed like fineliners and brush pens. Rather, you dip them into a bottle of ink and re-dip as soon as the ink runs out. This method is more akin to the kinds of pen and ink drawing done by artists from the past. https://louistydgj.bloguerosa.com/34597255/the-basic-principles-of-ink-drawing-for-beginners