Description Sailor Ink Studio #640 fountain pen ink is a medium shade of blue-black that comes from the Ink Studio Collection which consists of over 100 dye-based colors. Sailor Ink Studio inks are packaged in a 20ml glass bottle and each bottle comes with four converter labels to easily identify the ink you have in your pen. Sailor fountain pen ink is made in Japan, and is very well behaved, has good flow, and is easy to rinse out of 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 $50 for US customers, and for orders over $250 for our Canadian customers.