Guaranteed to be 100%; lightfast for up to 100 years under museum conditions, Derwent Lightfast Colored Pencils are professional-quality, oil-infused pencils with smooth, thick, creamy cores. They mix well with other media to create new colors. ASTM D6901-compliant. - Derwent Lightfast Colored Pencil - Set of 36Derwent Lightfast Pencils, 36 TIN - Includes one each of Sun Yellow, Champagne, Scarlet, Pale Peach, Salmon, Oyster, Heather, Nightshade, Violet, Violet Blue, Mid Ultramarine, Arctic, Dark Turquoise, Mallard Green, Spruce Green, Racing Green, Forest, Olive Earth, Seaweed, Brown Ochre, Yellow Ochre, Wheat, Sandstone, Sienna, Venetian Red, Ruby Earth, Sepia (Red), Natural Brown, Chocolate, Van Dyke Brown, Warm Grey, Cloud Grey, Mist, Midnight Black, Black, and White.