Acording to the ASTM Standards Organization, a colored pencil's lightfast rating is defined by how resistant the color is to the fading effects of light. Colors with a strong lightfast rating will maintain vibrancy in the presence of light, while colors with a weak lightfast rating will readily fade or change color over time. In the tradition of Prismacolor, each lightfast colored pencil has a soft, thick core to deliver the smooth, creamy laydown of coor that artists expect.

The American Society for Testing and Materials (ASTM Organization), in collaboration with the Colored Pencil Society of America (CPSA), developed the ASTM D6901 standard for colored pencil lightfastness. Prismacolor Premier Lightfast Colored Pencils fully comply with the ASTM lightfast standard.

• Highest ASTM Approved Lightfast Ratings
• Maximum Resistance to the Fading Effects of Light
• Rich Colors for an Ultrasmooth Laydown of Color
• Soft, Thick Cores for Superior Blending and Shading
• Artists' Palette of Professional Quality Colors

Set includes 12 Prismacolor Premier Lightfast Pencils in a metal tin