Because they are pure pigment, Sennelier Oil Pastels offer particularly strong and steady colors for dynamic yet subtle paintings. Created in the 1940's in collaboration with Picasso these creamy, lipstick-like pastels are rich in pigment, cover well, and have outstanding opacity and lightfastness. They may be thinned with turpentine and worked with a brush, are acid-free, and can be applied to any surface.