From the Conclusions ... 'Experimental studies focus mainly on the visual impacts of fire on potsherds. Fire effects on analytical properties of ceramics are less understood. Smoke blackening of sherds located at the ground surface is the most common fire effect noted. The permanency of smoke blackening on sherds remains a significant research question. Soot that cannot be washed off and other effects such as spalling, vitrification, oxidation, and crackling of slip can lead to the misidentification of some sherds. However, studies have found that potsherds affected by fire can most often be correctly identified in the lab.'