B. Fabbri et al., Archaeometric investigations of sgraffito ceramic tiles (Fifteenth-sixteenth centuries) recovered from excavations in Udine (North-east Italy), ARCHAEOMETR, 42, 2000, pp. 317-324
Most of the Renaissance sgraffito tiles excavated in Udine (Italy) constitu
te a homogeneous group, the tile body having a CaO/MgO molar ratio = 3:2. T
hey were produced using a dolomite- and calcite-containing clay fired at 90
0950%C. A small group of samples, with a lower firing temperature and a CaO
/MgO ratio = 2:3, was probably produced in a different factory. Slip and tr
ansparent glaze, characterized by optical microscopy and inductively couple
d plasma atomic emission spectrometry, are an illite-rich clay and a lead s
ilicate, respectively.