Fourier transform infrared spectroscopy applied to the characterisation of17th-20th century calcographic and xylographic inks

The aim of this paper is to optimize the analytical method for the characte risation of 17th-20th century calcographic and xylographic inks. It is very important to use not only non destructive techniques, but also analytical instruments that require a minimal amount of material so as to analyze uniq ue or valuable samples. and simultaneously to obtain as much information as possible about their composition. This study compares different ways of sa mple preparation for further analysis by Fourier transform infrared spectro scopy. It has been possible to analyze the most important absorptions that appear in the spectra and therefore to associate them with the compounds co ntained in inks. Some of the compounds identified are: hydro xyapatite (cal cium phosphate), Prussian blue (ferric ferrocyanide), linseed oil, carbonat es? nitrates and sulfates.