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IntroductionMultilayer materials of cultural heritage such as historical materials and artwork are analysed as cross-section samples using microscopy and FTIR microscopy. Most commonly, these samples are embedded in synthetic resin, ground and polished. During this process, there is a high potential for the synthetic resin to contaminate the sample. The resin penetrates into the open pores or cracks in the sample, or solvent of the resin can partially dissolve some layer of the analysed sample. In both cases, the presence of synthetic resin significantly distorts the results of analysis, particularly the analysis of peripheral layers, which are of course the most contaminated. Interpretation of the FTIR spectra of individual layers is very difficult; it can be ambiguous and largely subjective. Moreover, analysed layers are usually a mixture of substances, where the studied substance (for example organic binder) is present as a minor component.ResultsDue to potential contamination of samples processed with the aforementioned method, a new method of preparing samples is desired, one in which contamination of the sample caused by the embedding material would be eliminated. This paper compares the advantages and limits of different methods of sample preparation before analysis; methods which would eliminate the contamination of analysed materials. Various analytical methods and different procedures used for sample preparation are discussed. The most successful of the tested insulation methods proved to be that of pressing the sample in KBr pellet, gold sputtering and carbon coating or anticipatory treatment by cyclododecane solution before embedding the sample in synthetic resin.ConclusionIt can be concluded that these procedures eliminate contamination of the analysed sample regardless of its nature and morphology. This conclusion was confirmed by an analysis of real samples.

Methodology for infrared spectroscopy analysis of sandwich multilayer samples of historical materials