Description This 20ml bottle of Sailor Chu-Shu fountain pen ink is smooth-flowing and specifically formulated to be safe for all fountain pens. 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 $59 for US customers, and for orders over $250 for our Canadian customers.