## 4 Conclusions  
The use of the MA-XRF technique on furniture has provided information on the elemental spatial distribution of the decorative layers. In particular, the INFN-CHNet MA-XRF scanner, due to its versatility in terms of hardware adaptability (different size of collimators, use of the telemeter) and in terms of software settings (scanning speed and step size during the measurements, data saving for an off-line analysis) has proved to be suitable for studies on this genre of works of art. A number of results have been achieved in identifying materials in the decorative layer. In both cases, the data on the polychromatic surfaces have provided information on the materials used: for instance, the use of arsenic-based compounds in the chinoiserie cabinet and the use of different pigments in the engraved ivories of the writing desk by [PERSON]. However, the detection of only the elemental composition is a strong limitation for this kind of study. Therefore, the use of the technique is suggested as a first approach, while a multi-technical study is advisable for the identification of the compounds, as reported in [28]. For this reason, the INFN-CHNet group is involved in the development of instruments and techniques to support conservation processes, characterisation, and dating techniques in the heritage science field.  
Conceptualization, F.T., A.R. and A.L.G.; Data curation, L.S., L.G. ([PERSON]), A.M. and C.R.; Formal analysis, L.S., L.G. ([PERSON]), A.M. and C.R.; Funding acquisition, F.T. and A.L.G.; Investigation, L.G. ([PERSON]), C.R., L.C., M.N., R.T. and A.R.; Methodology, L.G. ([PERSON]), C.R., L.C., C.C., L.G. ([PERSON]), M.M., F.T., M.N., R.T., F.A. and A.R.; Resources, M.N. and S.D.B.; Software, L.C., C.C. and F.T.; Supervision, A.R.; Visualization, L.S., L.G. ([PERSON]), A.M. and C.R.; Writing--original draft, L.S.; Writing--review and editing, L.S., L.G. ([PERSON]), A.M., A.R. and A.L.G. All authors have read and agreed to the published version of the manuscript.  
The research was funded within the INFN-CHNet project. This project has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No 754511 (PhD Technologies Driven Sciences: Technologies for Cultural Heritage--T4C).  
Not applicable.  
\begin{table}
\begin{tabular}{c c c c} \hline \hline
**Area Scanned** & **Colour** & **Elements Detected** & **Materials Hypotheses** \\ \hline \multirow{3}{*}{Chinoiserie cabinet—flowers} & red flower & Hg & cinnabar-vermilion \\  & bright yellow flowers & Au & gold \\  & transparent yellow buds & As & arsenic-based compound \\ \hline \multirow{3}{*}{Chinoiserie cabinet—flying bird} & red tail and feathers & Hg & cinnabar-vermilion \\  & bright yellow outlines & Au & gold \\  & buff body & Fe & ochres-earths \\  & black-blue feathers & As, Si, Ca &? \\  & black tail & Pb & galena \\ \hline \multirow{3}{*}{Writing desk—drawer area 1} & green leaves & As, Cu & emerald green \\  & dark rust tone of the flower & Fe, Mn & ochres-earths \\  & rust tone of the flower & - & organic compounds \\  & white highlights & Pb & lead white \\ \hline \multirow{3}{*}{Writing desk—drawer area 2} & black-blue flower & Pb, Fe & Prussian blue and lead white \\  & green leaves & As, Cu & emerald green \\ \hline \multirow{3}{*}{Writing desk—external side} & green leaves & Cu, Cl & copper-based compound \\  & black-blue flower & Pb, Fe & Prussian blue and lead white \\ \cline{1-1}  & red flower & Hg & cinnabar-vermilion \\ \cline{1-1}  & blue-black dark stem & Fe, Mn & ochres-earths \\ \cline{1-1}  & dull yellow flower & - & organic compounds \\ \hline \hline \end{tabular}
\end{table}
Table 3: Summary of the hypothesised materials employed in the different areas.