Fig. 4
From: A multi-analytical study of the palette of impressionist and post-impressionist Puerto Rican artists
RGB composite images for a Co (red) and Zn (green) and b Cr (red) and Zn (green) highlighting the elemental overlap of Co and Zn (yellow) rather than Cr and Zn in CAM-1329. The nearly perfect Co/Zn overlap suggests the use of cobalt green and/or cobalt blue and zinc white mixture rather than the use of zinc chromate