A crayon made from pure powder pigments and a binder, such as gum or resin. The pigments used in pastels are the same as those used in oil paints. Pastels have been used widely since the Renaissance and major painters including Edgar Degas, Marie Cassatt, Edvard Munch, Pablo Picasso chose this medium as an alternate to oils at various times throughout their careers. Picasso lobbied the French manufacturer, Henri Sennelier, to produce a better grade oil pastel when supplies were scarce during the post-war years in Europe.