Description Diamine Ancient Copper fountain pen ink is a warm shade of reddish-brown. Diamine Ancient Copper ink is one of the most popular colors of all of the Diamine fountain pen inks. It is well-behaved and smooth flowing. The 80ml glass bottle has a sturdy square base, with a narrow neck.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.