Oil paint is one of the classic materials for painting. Oil became widespread among European artists in the 15th century, and many famous paintings were painted with it, including the “Mona Lisa” by Leonardo da Vinci.
It is a thick opaque paint, and it is easily distinguished by its appearance from watercolors, pastels, and almost all other materials, not counting acrylic, which can also be applied thickly.
Portraits with oil paints are made on canvas – a special fabric stretched on a stretcher.
Oil stands out among all other materials in that it takes a long time to dry, about 1 to 3 days, depending on the size of the painting and other conditions (unlike acrylics and watercolors, which dry almost immediately).