Fig. 27From: Recent progress in instrumental techniques for architectural heritage materialsa The PIXE spectrum collected from a 0.5 × 0.5 mm2 area in the same sample. Here, the barium Lα, Lβ, Lγ peaks were not visible; b the SEM–EDX spectrum of a barium-rich spot in the yellow pigments; c–f PIXE elemental mapping for iron, calcium, lead, sulfur elements in a red section [149, 297], copyright (2002, 2004) ElsevierBack to article page