14th century 19th century 3D scan Er:YAG laser FTIR FTIR spectroscopy History of engineering & technology Manet Materials science Maya blue Raman SEM-EDX Technology: general issues UV imaging UV-induced fluorescence X-ray diffraction X-ray fluorescence XRF adhesion and cohesion products ancient Egyptian ancient Egyptian painting materials archaeometry artificial ageing cleaning treatment conservation conservation of pictorial films on stone copper alloys cultural heritage eddy current efficacy evaluation