Drying oils act as agglomorating binders for artists’ oil paint and provide body to the brushstroke as the colours are spread out. Selection of the appropriate oil can alter the working quality of the paint. Performance differences include paste consistency, texture, effect on paint shades, desired drying time and mechanical strength of the paint film. Oils dry by absorbing oxygen, turning into a solid, non-reversable film. Full film drying takes up to six months.