Fountain Pen Ink - NeptuneNeptunes vast oceans in a bottle The Finest British Made Fountain Pen Ink Suitable for All Pens. For lovers of the sun, sea and sand, enjoy . Transform the way you create with an ink colour that sets you apart! Most pens offer ink cartridges in a limited selection of colours! we are bringing you this range of beautifully rich and distinctive inks with no need to dispose of, or replace an empty cartridge. They truly are a joy to write or create with!