Akkerman Dutch Masters 11 Vermeer's Kobaltblauw (cobalt blue) fountain pen ink in a 120 mL glass bottle.
Form follows function in the beautiful Akkerman ink bottles. Their vintage-styled glass bottles feature a marble stopper inside the neck of the bottle which, when tipped, fills the neck for easy filling. This allows east filling of your fountain pen without having to dunk the entire pen in the large bottle.