Pitt natural charcoal stick 9-15 mm Natural charcoals are the oldest sketching and drawing material in the world. The greyish-blue hue glides smoothly over the paper, rubs and stains easily, and can be easily erased and overlaid repeatedly. Their bluish hue has always fascinated, even with the old masters. Charcoal pencils leave a much blacker line. The coal packed with fuli gg ine and clay gives the pencils charcoal their intense black color and can be manufactured in different degrees of hardness. Natural Pitt drawing charcoal (Ø 9-51 mm) Fat and oil free Bluish-black line