The Finest British Made Fountain Pen Ink Suitable for All Pens. Symbolically dedicated by the Ancient Greeks to their Goddess of wisdom, Athena, the Mulberry tree is our chosen source of inspiration for our deepest, richest shade of red - a striking ink choice for your creative ventures. Transform the way you create with an ink colour that sets you apart! Most pens offer ink cartridges in a limited selection of colours! I want to change that by bringing you this range of beautifully rich and distinctive inks - with no need to dispose of, or replace an empty cartridge. These wonderfully free-flowing inks come in a number of beautiful and nuanced shades.