Description This 30ml glass bottle of Herbin Bouton d'or fountain pen ink is elegantly labeled and the bottle has an integrated pen rest. Bouton d'or is an intense and bright yellow hue. Herbin uses all natural dyes in their fountain pen inks, which is reflected in the very neutral pH of the inks. The inks are created to be non-toxic, and smooth flowing in your fountain pen.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.