Figure 7
From: Characterization of Castellani nineteenth-century gold jewellery by in situ micro-XRF spectroscopy
Plots of the gold X-rays lines ratios L3/M vs L3/L2. The ratios obtained from the homogeneous standards are shown in plot (a). The grey rectangle indicates in all plots the area covered by the standards (average ± 3σ) and used as reference. The ratios obtained from foils, granules and wires of all the Castellani jewels analysed are shown in graph (b). A selection of spots from graph (b) is given in graphs (c,d), showing jewels with ratios lower than those of the standards (c) or comparable to them (d).
