Tracing the origin of blue and white Chinese Porcelain ordered for the Portuguese market during the Ming dynasty using INAA

The existing documentary history of Chinese porcelain ordered for the Portuguese market (mainly Ming dynasty.) is reasonably advanced; nevertheless detailed laboratory analyses able to reveal new aspects like the number and/or diversity of producing centers involved in the trade with Portugal are lacking.In this work, the chemical characterization of porcelain fragments collected during recent archaeological excavations from Portugal (Lisbon and Coimbra) was done for provenance issues: identification/differentiation of Chinese porcelain kilns used. Chemical analysis was performed by instrumental neutron activation analysis (INAA) using the Portuguese Research Reactor. Core samples were taken from the ceramic body avoiding contamination form the surface layers constituents. The results obtained so far point to: (1) the existence of three main chemical-based clusters; and (2) a general attribution of the porcelains studied to southern China kilns; (3) a few samples are specifically attributed to Jingdezhen and Zhangzhou kiln sites. In a chronological point of view, for the studied samples we assist to an increasing improvement of the production procedure from late 15th till the 17th centuries of the Chinese porcelains sent to Portugal, especially enhanced by the association of late porcelains with refining processes of the original raw material, consistent with removal of more heavy minerals. In the case of some samples a kiln attribution was possible, but for the majority of the samples we haven't found yet the specific kilns.