Fig. 2

MA-XRF images of the painting shown in Fig. 1. Top left: optical image; grey scale images show single element distributions, with lighter gray values indicating higher XRF signals. Middle and bottom images of left row show zoomed area of left quince: (middle) composite false color image of As–K (yellow), K–K (blue) and Pb–M (grey); (bottom) composite false color image of As–K_β (red), Cu–K (green), Ca–K (blue), and Fe–K (white). Darker parts of the foliage correspond to higher K signals; slightly shaded areas of the quince correspond to higher Ca signals