Description Herbin Rouge Caroubier fountain pen ink is a bright pink-ish shade of red. The metal container contains 6 standard short international size cartridges that will fit most fountain pens that accept international cartridges. Herbin uses all natural dyes in their fountain pen inks, which is reflected in the very neutral pH of the inks. The inks are made in France, and have been created to be non-toxic, and smooth flowing in your fountain pen. Please note that these cartridges will not fit in pens that use proprietary cartridges. 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.