The Edson can be filled using international size ink cartridges
, such as the Pelikan and J. Herbin cartridges we carry, or can be filled with any bottled fountain pen ink
using the included converter. The clutch-cap mechanism allows for ease of use, and the satiny matte finish of the cap is highlighted by the glossy clip. Take a look at the barrel detail, below. In some light the black resin almost appears as a dark grey, which is characteristic of the black diamond in nature as well.