Box 72 Colored Pencils Lightfast Derwent These professional-grade colored pencils offer lush color and smooth laydown. Derwent Lightfast pencils have been formulated to be 100% lightfast, with a revolutionary core that is resistant to prolonged color change, ensuring your artwork will not fade for up to 100 years under harsh conditions. museum. Ideal for use in a studio or at home. Traditional and bright colors. Oil based. Brand: Derwent.