Fig. 1
a Analyzed shards with underglaze and overglaze decoration. Kiln sites, production date and XRF or Raman measurement areas are given (the dimensions are here reported: Shard #7: 12 × 9 cm2; #8: 16 × 13 cm2; #9 diameter: ~ 9.8 cm; #10: 9.5 × 8 cm2; #11: 7 × 5 cm2). b Fracture sections showing the glaze-body interface of the #8, #9, #10, #11 analysed shards acquired by using portable optical microscopy (50 magnification) along the fracture lines without any sampling