HERBIN "Jewel of Inks" Fountain Pen Ink - 30mL (with pen rest) - Bleu Azur (Azure Blue)The "La Perle des Encres", which translates to Jewel of Inks, were created in Paris in 1700. A traditional formula, made from all natural dyes, with a neutral pH. Water based dyes. Non toxic. Smooth flowing and fast drying. Supplied in the traditional HERBIN "D" bottles with integrated pen rest (refering to the French unit of measure Demi).