FTIR-PAS measurements were made using a PAC 300 photoacoustic detector accessory (MTEC Photoacoustics Inc., USA) for direct photoacoustic detection of optical absorption spectra of solids and semisolids with IR
Authors' contributions DT undertook all analysis and was principle researcher for the glass and wax projects. BP initiated the haze monitoring, deployed the glass slides and discussed the results and their interpretation. He provided access to the FTIR microscope used in the glass project. Both are...