Box of 12 Dermatograph pencil in 8 colors. A favourite amongst the builders, electricians, plumbers and whatnot, Dermatograph or Chinagraph pencils are the pencil that have been perceived by some as black magic, and to others just a darn good color pencil. They have the benefit of being able to write on almost any surface including paper, card, wood, glass, plastic, metal, leather and most surfaces.