In 1949 Sennelier started developing a range of artists' quality pastels for the famous artist Pablo Picasso. Picasso was looking for a pastel with intense colour that could be applied directly and freely to a wide variety of surfaces. As a result Sennelier created an oil pastel with a soft creamy quality with all the intensity and vibrancy of conventional oil colours. However unlike oil colours Sennelier oil pastels are made using a unique combination of non-agressive oils and waxes so that they can be used on almost any surface including paper without cracking or affecting the substrate. The pigments are ground with an inert non-siccative binding medium that does not oxidise and that has no effect upon either film stability or surface. This base is then mixed with wax (neutral pH). All colours in the range are 100% lightfast making the Sennelier oil pastel range probably the only true artists' quality oil pastel in the world. Colours: 1 White 6 Pale Blue 19 Lemon Yellow 23 Black 26 Yellow Ochre 34 Burnt Umber 42 Cinnabar Green Yellow 45 Green Medium 200 Mandarin 203 Delft Blue 220 Permanent Intense Red and 237 French Ultramarine Blue.