Each bottle of 30 ml/1 oz. is elegantly labeled and has a pen rest. They are known as 'D Bottle pen inks'. The 'D' refers to the old French unit of measure 'la Demi Courtine.'
J. Herbin is the oldest name in ink production in the world. By 1700, the company was producing 'l'Encre de la Tete Noire,' followed by the 'Perle des Encres' (The Pearl of Inks) and 'l'Encre des Vaisseaux' (The Ink of Ships).
As you can see here, The Pearl of Inks is still produced, and is available in 26 beautiful, radiant colors.
J. Herbin uses all natural dyes in their fountain pen inks. This relatively 'natural' composition is reflected in the very neutral pH of the inks.