Description Cross Blue fountain pen ink is a bright shade of blue and is archival. The container comes packaged with 6 proprietary Cross ink cartridges that will fit into all Cross fountain pens that accept cartridges. Cross fountain pen that is archival means the inks have a pH level that is neutral and acid-free and have been formulated to resist fading over time. Please note that these cartridges will not fit in pens that do not use Cross proprietary cartridges. 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.