Carboxylation 1 Copper corrosion 1 Cu formate 1 Cu formates Daguerreotype 1 Degradation 1 Fluorescence spectroscopy 1 Fourier series 1 Fourier transform infrared spectroscopy 1 Material components 1 Metal carboxylate 1 Multi materials 1 Multi-material structure 1 Multi-modal 1 Non-invasive sensing 1 OCT 1 Optical Instrumentation 1 Optical tomography 1 XRF 1 corrosion 1 daguerreotypes 1 metal carboxylates 1 non-invasive sensing 1 optical instrumentation 1 vibrational spectroscopy 1