In the oil painting binder for paints are specially prepared drying vegetable oils. In the production of modern oil paints use mostly linseed oil, and for some colors - walnut and poppy and sunflower oil. Unlike flax, they are less yellow, but dries to form a less durable film. Drying oil - a complex process involving oxidation, which lasts a very long time.
In the light oil dries much faster in the dark, it not only dries slowly, but turns yellow. Dampness also slows down the process. The rate of drying oils and pigments influenced by some of them, such as white lead and cobalt, speed up this process, and kraplak, soot gas - slow down. The oil begins to dry out from the surface on which a thin film that prevents the free access of oxygen and desiccation of the underlying layers. You probably noticed that the paint on the palette will soon cease to stain, but if they are a little pressure with your finger, you can verify that they are soft. Inside the paint almost did not change their density, but only solidified on top. This feature of drying oil binder has been known since ancient times. Artists sought to achieve a more uniform drying, and colorless films, get rid of harmful substances contained in the oils. For this they were washed with water, frozen out, boil.
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