For the presence of the same palette in a work, we use the analysis of pigments in additive synthesis (colour) by a colorimetric analysis and Raman spectrophotometry and for knowledge of the pigments by their molecular composition.
Another analysis is necessary SEM. The information provided is plentiful and diverse, besides the composition of materials, provides insight into the process undertaken during the course of painting.
This is research techniques that are required in an authentication protocol. Some are tests of exclusion and others are identification tests