Winsor & Newton Professional Watercolour French Ultramarine is a rich transparent blue. It is permanent with excellent lightfastness and granulation capabilities. It was created by French chemist Guimet in 1828 as a synthetic but chemically identical alternative to the expensive pigment derived from Lapis Lazuli.

Winsor & Newton Professional Watercolours are formulated using the highest quality production methods to achieve optimal pigment dispersion, meaning every wash will remain vibrant and luminescent. With a wide range of modern and traditional pigments, a majority of the Professional Watercolour range remain permanent and lightfast.