**4. Conclusions**

Cultural heritage conservation is having a new paradigm with new optical techniques. Moreover, the conservation procedure can be improved with the help of reflectance spectral measurements. In the case of deteriorated artworks, the spectral characterization is useful for having an objective "photography" of the current state of the pigments. Instrument resolution is also of high importance because of the higher resolution, more accurately data are collected on the artwork for future review. These data could lead us to virtually restore an artwork with previous data and with the curator and restorer help. As a conclusion, the reflectance measurement system must be chosen according to experimental necessities, and some experiments will require wavelength precision and others will require a small area detection. Color changes due to artwork deterioration or changes in lighting conditions are easily calculated with spectral reflectance data.
