Pitt Charcoal, Set of 10Natural charcoal is the oldest sketching and drawing material known to mankind. The greyish blue shade glides softly across the paper, rubs and smudges easily, and can be erased without difficulty and repeatedly overlaid. Their blueish hue has always held a fascination, even with the old masters. Compressed charcoal is the blackest drawing material that can be produced; very deep, intense black. The oil free pencils are produced from a mixture of soot