Description Waterman Mysterious Blue ink is a deep, rich shade of blue-black, and has great flow, and it behaves well in both vintage and modern pens. The box contains 8 standard long international size cartridges that will fit most fountain pens that accept the long length international cartridges. Waterman fountain pen ink is made in France. Waterman Mysterious Blue fountain pen ink was formerly called Waterman Blue-Black. Please note that these cartridges will not fit in pens that use proprietary cartridges. Interested in this color? Check out our thINKthursday blog post to learn more. 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.