*2.2. Mobile Raman Microspectrometry*

The high value of the porcelain artifacts made it necessary to conduct the noninvasive Raman analyses in the exhibition or storage rooms of the Musée du Louvre (Paris) and Musée Chinois (Fontainebleau Castle). A mobile Raman setup from HORIBA Scientific Jobin Yvon (Longjumeau, France) was used for the on-site measurements. This setup was composed of an HE532 spectrometer (920 lines/mm grating; resolution ~4 cm−<sup>1</sup> ), a remote optical device called SuperHead (Figure 1) and a 532 nm 300 mW Ventus laser source (Laser Quantum, Fremont, CA, USA), which were connected to each other by optic fibers. The SuperHead incorporates long working distance x50 (surface analyzed: ~10–20 µm<sup>2</sup> ; in-depth: ~5–20 µm) and x200 (surface analyzed: ~1 µm<sup>2</sup> ; in-depth: ~1–2 µm) microscope objectives for the green laser illumination and the collection of scattered light. Details about the procedures have already been published [13,17,18,20].
