Description Diamine Sargasso fountain pen ink is a rich shade of blue that leans toward purple and comes as a 4ml sample in a plastic vial with a dip at the bottom to allow you to easily get every drop, labeled with the name of the ink brand and color.Diamine fountain pen ink is considered to be well behaved and smooth flowing, and has been made in the UK for over 150 years.We offer Free Shipping on all orders over $69 for US customers!