Documented by Cennino Cennini, the appearance of Naples Yellow has not been clearly established ; true Naples Yellow is a lead antimonate that was frequently employed in past centuries. Its properties have now been rediscovered. But since genuine Naples Yellow is toxic, this colour is a substitute based on zinc oxide, titanium dioxide, and mononitrogenous “azo” yellow. A luminous, very lightfast colour, this yellow yields a rich, beautiful, dense paste. Suitable in all binders, including oil, watercolour, tempera and acrylic. Not suitable for fresco.