Description Diamine Blood Orange fountain pen ink is a dark, warm shade of reddish brown and comes in a triangular shaped 40ml glass bottle, as part of the Diamine Anniversary Collection. When 8 of the bottles are placed together, they form a round display. Diamine fountain pen ink is considered to be well behaved and smooth flowing, and has been made in the UK for over 150 years. Like this color? Check our the thINKthursday blog post for more details! 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.