Diamine's superb fountain pen ink in a smaller 30ml bottle, perfect for trying out a range of colours, or if you just don't use ink quickly enough to need a larger bottle. Diamine ink is safe to use in all brands of fountain pen and is one of the finest inks available. The huge range of over 100 colours are all water-based, acid-free and non-toxic, and vegan-friendly.

The handy 30ml plastic bottle is easier to carry, and the tall slim design means you can use more of the ink without having to tip the bottle at awkward angles. The one caveat about this bottle design is that the opening is very small, larger fountain pens probably won't fit into the bottle. We would advise filling your converter directly from the bottle.

Lady Grey is a 2025 collaboration with the r/fountainpens subreddit, following on from the popular Earl Grey. It's an elegant purple/grey with touches of pink showing through.

We have worked with Diamine to make special colours that are exclusive to Cult Pens - see the Cult Pens Deep Dark Inks.

Also available in larger 80ml glass bottles.

A limited range is also available in cartridges.