Fig. 4

XRF spectra of celluloid dentures MG.M-09686 (dentures 1 and 2) and vulcanite dentures MG.291116.0046 and MG.291116.0049, normalized to the maximum (corresponding to Zn Kα emission line). A higher relative intensity of vulcanite's Hg emission lines is observed. The analysis points are marked in the images of the dentures