10.1371/journal.pone.0163565.g005 Clodoaldo Roldán García Clodoaldo Roldán García Valentín Villaverde Bonilla Valentín Villaverde Bonilla Isabel Ródenas Marín Isabel Ródenas Marín Sonia Murcia Mascarós Sonia Murcia Mascarós Normalized net areas of the Fe K-lines versus the normalized net areas of the Ca K-lines from the painted and unpainted zones of the Parpallo’s Cave plaquettes. Public Library of Science 2016 motif CIEL decoration rock substrates results show Unique Collection Parpall ó Cave Spanish Mediterranean region fluorescence iron signals Yellow Pigments reflectance curves Palaeolithic sites pigment Palaeolithic Painted Portable Art energy dispersive X-ray fluorescence spectrometry EDXRF colorimetric perception iron oxides FT-IR analyses 2016-10-12 17:37:32 Figure https://plos.figshare.com/articles/figure/Normalized_net_areas_of_the_Fe_K-lines_versus_the_normalized_net_areas_of_the_Ca_K-lines_from_the_painted_and_unpainted_zones_of_the_Parpallo_s_Cave_plaquettes_/4027251 <p>(a) Motifs with red pigments. (b) Motifs with yellow pigments.</p>