Fig. 7
Photomicrograph taken in the left perimeter of the tablecloth, where a small area of the green color that was preserved, possibly because it was protected from light by a frame, is indicated with a red arrow. Original magnification ×165. The approximate location where this image was taken from is indicated in Additional file 1: Fig. S5 (a). Photomicrograph taken in a highlight area of the tablecloth showing the particles of ultramarine blue glazed over a white underlayer. Original magnification ×480 (b)