While the bottled fountain pen inks seen on our Inks page can be used in any fountain pen having a converter, piston-fill, or other reservoir system (that includes every pen we sell new with the exception of the Sapporo Mini), cartridge inks fall into two broad categories--international and proprietary. Pelikan cartridges are international and can be used in a wide variety of fountain pen brands, including Bexley, Montegrappa, and Pelikan's own Ductus series.

Aurora, Platinum, Pilot-Namiki, and Sailor ink cartridges are proprietary, usable only in their respective pen brands--note that Platinum makes the ink cartridges used in Nakaya pens. In turn, pens from these manufacturers can only utilize their own proprietary ink cartridges--with the exception of Nakaya/Platinum, which offers an adaptor (available from us at a nominal cost) allowing their pens to use international cartridges in addition to the Platinum brand. Still have questions? Don't hesitate to call or e-mail for more information.