The Daler-Rowney Oil Mediums Purified Poppy Oil is a premium, slow-drying natural oil binder specifically refined to mix with oil pigments and pale colors. This clear oil increases paint fluidity, improves transparency, and reduces the consistency of heavy tube colors while offering exceptional resistance to yellowing over time. It is an ideal medium for wet-on-wet blending techniques and detailed glazing layers, particularly when working with whites, blues, and delicate pastel tones.