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. Its smooth oil base creates a rich vibrancy and can be mixed on the page to create a paint-like effect. Discover this range of colours which are compatible with alternative mediums and pencils. All colours are professional quality and comply with international lightfast testing standard, ASTM D6901 and Blue Wool Scale ISO 105.