Acme fountain pens can be refilled with standard international-sized ink cartridges or with an ink converter and a bottle of ink.
Colorado Pen offers international-sized ink cartridges in 12 different colors. This specially formulated ink helps keep your Acme fountain pen writing smoothly.
If you opt for the more economical route of ink converter and bottled ink, the recommended converter is shown below. The Colorado Pen bottled ink has the same features as our ink cartridges: dries out nibs less readily and keeps ink flowing smoothly with a patented cleaning agent. It also comes in a huge 90ml bottle. However, any brand of bottled in will work in your Acme fountain pen.