Technology and organization of black pottery production on the north coast of Peru

Not all «black» pottery was produced in the same manner just as their social and symbolic uses and reasons for production varied a good deal. Nor are many examples truly black. The Middle Sicán culture (AD 900-1100) on the north coast of Peru distinguished itself with the perfection and large-scale production of black pottery made of fine paste. Based on our «holistic» study of a Middle Sicán workshop (including experimental firing and detailed chemical analyses of both archaeological and experimental samples), we present a detailed characterization of the blackware production technology and organization. Our study revealed that the glossy Middle Sicán blackware resulted from various factors including firing under strongly reducing conditions in small semi-closed kilns, an even carbon deposition on the vessel surface as well as penetration into the body, and the formation of graphite crystals on the well-burnished surface. Chimú reduced ware, in contrast, is typically made of coarser pastes, not as well burnished, and fired in relatively large “pit kilns” that did not permit a tight control over temperature and atmosphere. We infer that the prestige of the Middle Sicán religion and its art together with the lustrous, truly black appearance of the pottery that had been rarely achieved before played an important role in establishing the popularity of black pottery not only in the Sicán heartland but also much of the coastal Peru.