Delta fountain pens can be refilled with standard international-sized ink cartridges or with an ink converter and any brand of bottled ink. A few Delta fountain pen models are piston fill, which means bottled ink only is used.
Colorado Pen offers international-sized ink cartridges in 12 different colors. This specially formulated ink helps keep your Cartier fountain pen writing smoothly.
If you would like to use bottled ink, your Delta fountain pen should have arrived with an ink converter. But if you don't have one, you will see one featured with the bottled inks shown below. Colorado Pen bottled ink arrives in a huge 90ml bottle. Pelikan offers standard ink or its premium Edelstein ink in nine vibrant colors. Waterman bottled ink is offered in all the favorite colors.