Greaves, Aspen ; Allison, Jim (Brigham Young University)
Faculty Advisor: Allison, Jim (Family, Home, and Social Sciences; Anthropology)
Portable x-ray fluorescence (PXRF) analysis is a quantitative measure of the presence of an element. Elements from painted red ware sherds from the San Juan region were measured on painted and non-painted portions of the sherds, demonstrating the presence of elements in the paint as opposed to the paste. In particular, manganese, lead, and copper, along with a more ubiquitous iron, were found in the paint. The presences of manganese indicates the intention for the paint to be black when fired, a useful tool in identifying sherds. At Site 13 (42sa13) for example, which was burned, the sherds can appear to be Abajo red-on-orange when they may better be described as Bluff black-on-red. Lead and copper are a bit less straight-forward. Lead appears rarely, and may have no purpose, or could be an intentional sourcing choice. Another question comes from the presence of copper, which may have created a turquoise paint pre- firing. Turquoise is an important color in Pueblo color theory, and so if copper does create a turquoise paint, the presence of copper may be deliberate. Variation in paint, particularly crossed with neutron activation data, leads to a firmer understanding of decisions inherent in the ceramic creation process.