Sennelier extra soft pastels are composed of high quality pure pigment grounded with a natural transparent binder. All tones are made up of delicate shade gradients, tending towards white.The exceptional brightness is the result of the pigment and of the natural mineral fines discovered by Sennelier in 1905. They have been used ever since. Their comfortable handling and large contact surface allow large areas to be covered with a high degree of regularity.