Mid and near-infrared reflection spectral database of natural organic materials in the cultural heritage field

Abstract

This study presents mid and near-infrared (7500-375cm-1) total reflection mode spectra of several natural organic materials used in artworks as bindingmedia, consolidants, adhesives, or protective coatings. A novel approach to describe and interpret reflectance bands as well as calculated absorbance after Kramers-Kronig transformation (KKT) is proposed. Transflection mode spectra have represented a valuable support both to study the distorted reflectance bands and to validate the applicability and usefulness of the KK correction.The aim of this paper is tomake available to scientists and conservators a comprehensive infrared reflection spectral database, together with its detailed interpretation, as a tool for the noninvasive identification of proteins, lipids, polysaccharides, and resins by means of portable noncontact FTIR spectrometers.