Portuguese tin-glazed earthenware from the 16th century: A spectroscopic characterization of pigments, glazes and pastes

摘要: Abstract Sherds representative of the Portuguese faience production early-16th century from “Mata da Machada” kiln and an archaeological excavation on a small urban site in city Aveiro (from late 15th to early 16th century) were studied with use non-invasive spectroscopies, namely: ground state diffuse reflectance absorption (GSDR), micro-Raman, Fourier-transform infrared (FT-IR) proton induced X-ray (PIXE). These results compared ones obtained for two Spanish productions, Valencia Seville, both same period (late century), since it is well know that Portugal imported significant quantities those goods Spain at time. The evidence clear similarity micro-Raman spectrum glaze clays pottery produced sherds found mediaeval house Homem Cristo Filho (HCF) street Aveiro. blue pigment sample household cobalt oxide exists silicate glassy matrix amounts, which did not allow formation detectable microcrystals. White Mata Machada tin signatures superimposed bending stretching bands SiO2. All these are quite different products under study (Seville Valencia), pointing earlier earthenware than mid century, as commonly assumed.