Winsor & Newton Artisan Water Mixable Oil Colours - Cerulean Blue - 37 ML is magnificently designed to look and work just like traditional oil paint. The key difference between Artisan and conventional oils is its ability to thin and clean up with water. Artisan has been specifically developed to appear and work just like conventional oil colour. The depth of colour, buttery consistency, light fastness, opacity/transparency, performance and drying times of Artisan, allow artists to use this range for all oil colour techniques. Cerulean Blue was developed in 1805 and entered the English market in the 1860s. Its name derives from the Latin Caeruleum meaning sky-blue pigment. It is a bright blue pigment with green undertones.