Oil Pastels have excellent color opacity and provide smooth color laydown for rich oil pastel effects. Vivid colors with intense luminosity for encaustic, pastel and scraping techniques. In addition to their good lightfastness, they are very soft and easy to blend with your finger or white spirit. There are endless possibilities of blending individual colors to create new hues. Aspiring artists also have the option of thinning with baby oil. Acid-free.