Herbin is the oldest name in pen inks in the world. "The Jewel of Inks" was created in Paris in 1700.
Herbin uses all natural dyes in their fountain pen inks. This natural composition is reflected in the very neutral pH of the inks.
Each bottle contains 30ml of ink - The "D" from their name refers to the old French unit of measure "la Demi Courtine".