Faber-Castell does not publish the color index or name of pigments used.
The lightfastness of a pencil lead does not depend on pigment alone.
Lightfast influences include:
Particle size of pigments
Matrix of formulation (e.g. filler, waxes)
Quantity of pigments
Faber-Castell is not using toxic pigments. Cadmium or Cobalt pigments are not used for colored pencils with the color name cadmium yellow lemon or cobalt blue for example.
The products are certified by a U.S. toxicologist.