There are various types of oil which are used as binders and drying agents (oil plus pigment dries by a process of oxidation by absorbing oxygen from the air) by oil painters. Linseed oil, made from flax seeds, adds gloss and transparency to paints and dries very thoroughly (within 3-5 days), making it ideal for underpainting. Stand oil is a thicker type of linseed oil, with a slower drying time (7-14 days), which is often diluted with (eg) turpentine, and used for glazing to produce a smooth, enamel-like finish with minimal traces of brushmarks. Poppyseed oil, much paler, more transparent and less likely to yellow than linseed, is often employed for white or lighter colours. Poppyseed oil takes longer to dry than linseed oil (5-7 days), so it is perfect for working wet on wet. Walnut oil is a thin, pale yellow-brown oil (dries in 4-5 days) which is commonly used to make oil paint more fluid.
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