In recent years, FTIR spectroscopy has increasingly been employed to analyse the surfaces of materials and objects before their restoration, providing valuable information for choosing the best restoration method. Typical absorption patterns in the IR-spectrum allow the identification of substances present in the sample. The ALPHA FTIR spectrometer in combination with the front reflection module offers a fast and easy method to measure infrared spectra of mural paintings or paintings on-site and in a contactless and non-destructive manner. Equipped with a front-reflection module the ALPHA just has to be placed in front of the art object to perform the analysis. An integrated video camera allows to exactly define the sample area to be measured. To allow flexible access to large samples the ALPHA can also be placed on a tripod. In addition, the ALPHA’s battery and wireless options enable extra portability features.
Raman spectroscopy can identify pigments (e.g. the mineral from which the pigment is derived) and with the proven micro spot Raman microscope, the colorants of single fibres (Marco Leona article). Raman also allows the imaging of an area by “scanning” the area using a XY stage of the microscope.