Oil paint considered drying, those with an iodine number of 115-130 are semi-drying, and those with an iodine number of less than 115 are non-drying. Linseed oil, the most prevalent vehicle for artists' oil paints, is a drying oil. When exposed to air, oils do not undergo the same evaporative process that water does. Instead, they polymerize into a dry semisolid. This rate of process can be very slow, depending on the oil. The advantage of the slow-drying quality of oil paint is that an artist can develop a painting gradually. Earlier media such as egg tempera dried quickly, which prevented the
Vateria indica oil Vateria indica oil "Vateria indica" oil is extracted from the seeds of the "Vateria indica" plant, a species in the Dipterocarpaceae family. The "Vateria indica" plant is indigenous to the Western Ghats, Kerala and Tamil Nadu regions of India. It thrives in the evergreen forests, surviving up to 800 meters above sea level. Oil from the seeds of the plant is extracted through a chemical refining process which makes the plant edible. Dhupa kernels are approximately 47% of the fruit, with the average kernel weighing 55 grams. The color of the kernel is reddish white or green, and it has