Twelve short international cartridges, which fit every pen in this catalogue except the Quire, filled with the same Registry Violet that goes in the bottles — not a reformulated cartridge version. Each holds about 0.7 ml, which is roughly four to six pages in a medium nib.
Cartridges get a bad name among people who use bottled ink, mostly for good reasons: the choice is narrow and the cost per millilitre is four times higher. What they are genuinely better at is travel and lending. A cartridge pen cannot leak from a converter seal at altitude, and a pen you have lent to someone can be refilled by them without a bottle.
The tin is a slide-top rather than a hinge, because hinges fail and a loose cartridge in a bag eventually gets stood on. Empty cartridges can be refilled from a bottle with a blunt syringe, several times, before the shoulder splits.
