Description This 60ml glass bottle of Private Reserve Buttercup fountain pen ink has a ridged cap for easier opening and closing. Private Reserve Buttercup fountain pen ink is a vibrant, golden shade of yellow. Under new ownership in 2021, Private Reserve Ink features bright, vibrant colors with excellent flow. 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.