One of the medium on use is oil paints famous for the look and originality that the oil paint brings in to the paintings. The oil used in painting kept on changing keeping in mind various factors of viscosity, solubility, comfort ability, the color required for the painting and the drying time. Some oils used in historical periods could be flax, walnut, Olive oil or poppyseed oil but the drying time was long for these and in the case of olive oil it was excessively long which brought in usage of drying oil as a varnish on oil paintings.