Richeson offers two types of charcoal in wooden box sets – Natural Willow or Compressed. The Natural Willow Charcoal is produced from willow branches scorched without air access. They feature smooth coverage of a soft-medium grade, which provides easy shading from black to pale grey. The Compressed Charcoal is made from a scorched blend of black, wood ground charcoal, gas and Chasov Yar clay. It is a soft-medium grade, producing even coverage.