Oil paint is a form of slow-drying paint that consists of particles of pigment suspended in a drying oil that forms a tough, coloured film on exposure to air. The drying oil is a vegetable oil, often made by crushing nuts or seeds. For paints, linseed oil is most commonly used, but poppy, sunflower, safflower, soya bean and walnut oils can also be used.Oil paint continues to dry, getting harder with age over many decades. Pigments and extenders will also affect the rate of drying, so different colours may dry at different speeds. Source: tate.org.uk. AWDB highlighted artist: Jigger Cruz.