The earliest stamped hard pottery and high-firing technology dating back to 5000 BP: Evidence from two sites in southeastern China

This study focuses on the technological origin of stamped hard pottery, one of the precursors to Chinese porcelain, developed in the Late Neolithic period of China. 160 ceramic sherds of stamped hard wares from the Nanshan site (5300–4300 cal. BP) and Yanzaidong site (5000–4300 cal. BP) were investigated through water absorption, Vickers hardness, petrography, ED-XRF, thermodilatometry, XRD, and SEM-EDS. The results indicate that two categories of samples exhibit commendable physical properties, comparable to stoneware, attributed to specific high-alumina clay with low fluxing elements (porcelain stone), fired at high temperatures ranging from 1100 to 1250 °C. The other categories of samples appear to be defective products during firing process, or have another raw material source, contributing to a diversity of pottery at the two sites. Nanshan and Yanzaidong unequivocally emerge as the earliest known production of stamped hard pottery, dating back to 5000 cal. BP, marking a revolutionary advancement in high-firing technology during the Late Neolithic China.