The main objective is the knowledge of the pigments which were used in the artworks. Since every pigment is used in a time frame, the identification of the color palette used by the artist allows the dating of the artwork.
This non-destructive molecular identification is achieved using Raman spectroscopy. All substances , when illuminated with monochromatic radiation (laser) disperse own frequencies which are specifically related to molecules which compose such substances.
In addition, the knowledge of the pigments constituting an artwork allow the future restoration work to be properly carried out in order to use materials chemically compatible with the original, avoiding medium and long term curation problems.