Koh-I-Noor's Toison d'Or Extra Soft Pastels are made from the finest pigments acquired from around the world. Becasue these pastels are made with minimal binding agents, the pigments are more concentrated nd easily distribute color to both light and dark supports. The looseness of the color particles allows artists unlimited possibilities in terms of tone and richness, and offers superb blending capabilities. A final fixative is highly recommended to prevent unwanted distribution of pigment particles.