Fig. 6From: The use of infrared spectroscopy and chemometrics to investigate deterioration in vegetable tanned leather: potential applications in heritage scienceClusters obtained from the k-means clustering of the time series trends for each peak in the FTIR spectrum of leather samples degraded at pH 3 (black) and pH 5 (red). Peaks following the same trends are clustered together, regardless of pH groupBack to article page