Description A 3ml sample of Sailor Chu-Shu fountain pen ink, labeled with the name of the ink brand and color, in a plastic ink sample vial with a dip at the bottom to allow you to easily get every drop. Chu-Shu is a deep, dark shade of purple that in certain light can look blue-black or even black.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.