Fig. 7From: Portrait of an artist at work: exploring Max Ernst’s surrealist techniquesSpectral features of the ZC and in GA: a XRF identifying strontium chromate in a yellow shade of ZC and b in-situ Raman spectrum identifying vermillion in a red shade of ZC with the typical bands located at 251 cm−1, attributed to δ(S-Hg-S), and 340 cm−1, ascribed to ν(HgS). c XRF spectrum of a red paint in GA identifying cadmium redBack to article page