Dating back to a small boutique in Paris in 1700, Herbin Fountain Pen Ink is one of the best in the world, both in smoothness of writing and breadth and brilliance of colour palette. Gris Nuage captures the essence of a cloudy sky at sea, when it slightly darkens just before a storm. It is a fairly light grey and tends more towards blue-black than pure black. All Herbin inks are pH neutral and non-toxic. They are water-based and therefore will run if wetted. The inks are light fast and only natural dyes are used. We recommend high quality paper with Herbin Ink.