Description Diplomat Deep Blue fountain pen ink is a bright, vibrant shade of blue and comes as a 3ml sample in a plastic vial with a dip at the bottom to allow you to easily get every drop, labeled with the name of the ink brand and color. Diplomat fountain pen ink is specially formulated by Octopus Fluids of Saxony, Germany to perform beautifully in your fountain pen. Having trouble deciding between colors? Use our Ink Comparison Tool to quickly and easily view different colors side by side. We offer Free Shipping on all orders over $59 for US customers, and for orders over $250 for our Canadian customers.