Description Diamine Shimmertastic Rockin Rio fountain pen ink is a dark shade of orange with gold shimmer particles, and comes in a 50ml glass bottle. The shimmer particles do fall out of suspension, so we recommend that you cap the bottle tightly, and use a gentle rocking motion to remix the ink and shimmer together before filling your pen. Diamine fountain pen ink is considered to be well behaved and smooth flowing, and has been made in the UK for over 150 years. 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. We offer Free Shipping on all orders over $50 for US customers, and for orders over $250 for our Canadian customers.