Fig. 2From: The use of infrared spectroscopy and chemometrics to investigate deterioration in vegetable tanned leather: potential applications in heritage scienceFTIR spectrum of untreated leather compared to that of sample treated for 28Â days at pH3, with key peaks highlighted (peak assignments based on Malae et al. [33]). Some differences between samples can be observed through visual inspection of the spectra, particularly in the amide related peaksBack to article page