“Take your linseed oil and in summer pour it into a bronze or brass basin, or into a bowl, and when the sun is in the sign of Leo, expose it to the sun, and this oil, if you hold it so long, that it will be half gone, will be as perfect as possible for painting” (C. Cennini, “A Treatise on Painting”). Cennino Cennini, born in 1370 in Colle di Val d’Elsa, died […]