What are drying oils such as linseed oil used for in paint?

Drying oils, such as linseed oil, are critical components in oil paints because they provide a means for the paint to dry and form a solid film. They serve several important functions in the painting process. Specifically, drying oils contribute to the paint’s consistency, allowing it to flow more easily and spread smoothly on a surface. The use of these oils also influences the drying time of the paint, which is essential for artists who may want to rework their paintings or layer different colors.

The key characteristic of drying oils is their ability to undergo oxidation and polymerization when exposed to air, transforming from a liquid to a solid state as they dry. This process not only ensures that the artwork maintains its intended appearance but also that it adheres well to the painting surface. While other options may seem plausible in the context of painting mediums, they do not reflect the primary function of drying oils as correctly highlighted by the correct answer.