Description 80ml glass bottle of Diamine Presidential Blue fountain pen ink. Diamine Presidential Blue fountain pen ink is a true blue.Check out our thINKthursday blog post for a thorough review of this ink.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.