Oil paint
Oil paints may require the use of solvents such as mineral spirits or turpentine to thin the paint and clean up. These solvents generally have some level of toxicity and can be found objectionable. Relatively recently, water-miscible oil paints have been developed for artists' use. Oil paint films can gradually yellow and loose their flexibility over time creating cracks in the paint film ensuring the "fat over lean" rule must be observed to ensure its durability.