Fig. 2

XRF spectrum obtained from white-pigmented bird’s beak on Transitional Inka/Early Colonial qero (MMA 1994.35.14) as shown in the inset, using the Bruker Artax 400 instrument at 10 kV with Rh target, 0.65 mm collimator and helium flush, featuring the strong Ti K-lines and, for their low-energy, the significant Si K-lines as well. Other weaker labeled peaks are plausibly associated with common accessory minerals and/or the surrounding pigments. The broad unlabeled peaks at 2.69 and 2.83 kV represent the L-lines of the Rh target