Fig. 4
From: Optimizing compositional images of daguerreotype photographs using post processing methods
X-ray fluorescence spectrum of a tarnished daguerreotype. Convolved X-ray peaks in the vicinity of 2200 eV: Au (2123 eV) from the gilding; Hg (2195 eV) from image nanoparticles; and S (2308 eV) from Ag sulfide tarnish. The shaded spectral region of interest ROI outlined by dotted lines represents the sum of Au + Hg Mα X-ray lines. Deconvolved peaks: Au Mα (green); Hg Mα (blue); S Kα (dark green); and Ag Lα (cyan) shown beneath the convolved/sum spectrum (red)