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Heritage Science
Fig. 4 | Heritage Science

Fig. 4

From: Jackson Pollock’s Number 1A, 1948: a non-invasive study using macro-x-ray fluorescence mapping (MA-XRF) and multivariate curve resolution-alternating least squares (MCR-ALS) analysis

Fig. 4

Signature spectra for the twelve components (11 paints and canvas) extracted by MCR-ALS and identifying characteristic lines for the elements present. Some of the peaks correspond to spectral and experimental artifacts such as escape peaks, pile up and contributions from the instrument and are thus not labelled. The small negative peaks in some of the signature spectra are mathematical artifacts due to the constraints imposed (non negativity). The relative intensity of the Ba characteristic lines varies and this is due in some cases to the overlapping Ti, Cr or Mn lines, and in other cases to the expected change in the BaLα1/BaLβ1 ratio when the element is present in an underlayer [7]. This might also be due to limitation of the MCR algorithm and its ability to split the contribution of this element between a significant number of components

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