Diamine's superb fountain pen ink in an 80ml bottle. Diamine has manufactured in England since 1864. 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 are vegan-friendly. The Diamine bottle is a retro delight with its ribbed design. Bottle contains 80ml (approx 2.8 fluid oz). The WES Imperial Blue was a special edition for the 25th Anniversary of the Writing Equipment Society, which was popular enough that the colour has become a permanent fixture on the Diamine catalogue. Monaco Red was formulated for Prince Rainier III of Monaco and the Grimaldi family. Diamine Royal Blue was used by presidents Obama and Medvedev to sign the nuclear arms treaty in April 2010. The full range of colours is also available in smaller 30ml bottles - ideal for trying more inks - and a limited range is available in standard international cartridges.