Winsor & Newton Artisan Water Mixable Oil Colours - Yellow Ochre - 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. Yellow Ochre is a warm yellow colour. Originally made from natural iron oxides found in earth, it is one of the oldest pigments used by mankind. A synthetic version became available in the 1920s.