## 3 Results and Discussion
### Writing Desk by [PERSON]  
The _Scrivania con scansia_ by [PERSON] has been analysed to characterise the decorating layers up on the marquetry. Three different areas were selected for this purpose: two areas on a drawer placed inside the writing desk, and one on a side, as shown in Figure 4. The choice was based on the hypotheses of different materials used and two possible conservation states inside and outside the writing desk. The scanning parameters are reported in Table 2. Because of the small size of the details of the decoration, a better spatial resolution compared to the lacquered cabinet was required. Since the scanner has an available set of different collimators, for this application the smallest one, with the diameter of 400 \(\upmu\)m, has been used. Thanks to this feature, a higher spatial resolution has been achieved in the elemental maps. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**Area**} & **Dimension** & **Source Voltage** & **Anode Current** & **Scanning Speed** & **Collimator Diameter** & **Step Size** \\  & **(mm\({}^{2}\))** & **(kV)** & **(\(\upmu\)A)** & **(mm/s)** & **(\(\upmu\)m)** & **(mm)** \\ \hline Drawer area 1 & 30 \(\times\) 13 & 38 & 50 & 1 & 400 & 0.2 \\ \hline Drawer area 2 & 20 \(\times\) 10 & 28 & 50 & 1 & 400 & 0.2 \\ \hline External side & 40 \(\times\) 130 & 28 & 70 & 1 & 400 & 0.2 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Scanning parameters of the areas analysed on the _Scrivania con scansia_ by [PERSON]. Figure 4: Selected areas for the measurements: (**a**) selected areas outlined in yellow and the two points in the black and red shades on the drawer; (**b**) particular of the external side. The scanned areas are outlined in yellow. The elemental maps of the first area of the drawer are shown in Figure 5. From the maps of lead (Figure 5c,d) it can be seen that its presence is detected in correspondence of the white highlights of the flower, most likely due to the use of lead white [41]. The shading in the central part of the flower is related to the presence of iron (Figure 5g) and manganese (Figure 5h), which may lead to the hypothesis of the use of orchestr earths [39]. In the green leaves, high signals of copper (Figure 5f) and arsenic (Figure 5d,e) are clearly visible. Even though this can be explained by the presence of a copper-based pigment or dye mixed with an arsenic-based compound, the literature suggests that this combination is an unlikely possibility, whereas the green colour may be related to the use of emerald green or [PERSON]'s green [39; 42]. However, it is reported that the latter has only been used since 1814, excluding its use for this piece of furniture; therefore, it is plausible that emerald green was used for the green leaves. The maps in the second area of the drawer, reported in Figure 6, confirm the same results of the first map, even though the black-blue flower on the top left shows a higher contribution of lead and iron. From the present literature, no single pigment is directly associated with the presence of those two elements [38; 39]. Their presence can be explained by the use of Prussian blue combined with lead white, as reported in [43]. In the second area of the drawer shown in Figure 4, two points have been measured: one in the red tone and the other in the black tone. The measuring time was set to 120 s for each one to enhance the statistics of the spectra. As can be seen from Figure 7a, in the red tone the most intense peak is the calcium peak, probably related to the ivory beneath the decorative layer, whereas no other element with an atomic number above sodium was detected with relevant statistics. This result may indicate the use of organic dyes for this colour. The spectrum of the black-blue point (Figure 7b) shows a different elemental composition: the most prominent peaks are related to iron and lead (calcium is also present as a second peak in terms of intensity), confirming the result already discussed above.