Colored Pencil Info
Derwent Signature was a  line of pencils that were developed to be very light fast. They have been discontinued, likely due to the high cost and rather hard cores. The endcaps tended to have the paint crack up over a fairly short time period, which was not good for such an expensive pencil. They came in 60 colors.

  Derwent Signature (Lightfast, now discontinued)