Fig. 8From: Exploring elucidation of red dye mixtures on woolen historical textiles via non-destructive spectroscopic analysis and multivariate cluster analysisPCA Scores plots for the (a, c) XRF trimmed & preprocessed spectra, (b, d) XRF trimmed, preprocessed, & variable selected spectra. Points are colored by (a, b) swatch, and (c, d) FORS decision rule “classes” following the same color coding as in Fig. 7. The different scales are intentional to ease visualizationBack to article page