Derwent's Lightfast coloured pencil is their premium pencil, available in a huge range of rich, vibrant colours. Professional quality pencils, each of which has attained a lightfast level of either LF1 or LF2, which means that they are considered fully compliant with the ASTM 6901 and Blue Wool Scale ISO 105 standards. The oil-based core is resistant to prolonged colour change, ensuring museum-stored artwork stays as vivid after 100 years as it did when it was first created. The smooth, creamy laydown of opaque colour is compatible with oil mediums, and produces a paint-like effect when dissolved. Note that this may affect lightfastness. Strong point for ease of sharpening; ideal for detailed drawings and defining negative space. Round wood casing with a light lacquer. End-dipped with the core colour and stamped with 'Made in Britain' and 'Derwent Lightfast'. If you'd like to get hold of just the 28 new colours, we've created a bundle. Derwent Lightfast pencils have been formulated to be 100% lightfast. The revolutionary core is resistant to prolonged colour change ensuring artwork will not fade for up to 100 years under museum conditions. Available in a carefully selected range of 36 vivid and opaque colours. Choose from a wide palette of rich and vibrant colours to realise every artistic vision. Product Details: Oil-based - Oil-based for superior control over colour layering, opaque colour with excellent blending qualities. Pigments completely integrate to form a new colour, blending like oil paint for a natural look with blending fluid. Professional Quality - Utilising superior quality pigment formulated to be 100% lightfast under museum conditions lasting for 100 years. Compatible with other mediums - Lightfast pencils can be used along side other pencils in the Derwent range and will intermix with Procolour and Coloursoft, or use along side Watercolour and Inktense pencils for vivid colour and washes. Download colour chart here