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K19-3, a perforated upper half-valve of Pecten maximus from level I-k at Cueva Antón (height: 120 mm). (Upper) The internal, naturally red side (Left) and the external, whitish side that was painted with an orange colorant made of goethite and hematite (Right). (Lower) binocular microscope close-ups on pigment masses and pigment stains around the perforation. See also SI Appendix, Section VI, Figs. S25 and S26.
