Fig. 5

Head of peasant: IRR-Fe-Mn distribution. Superposition of the infrared reflectography (Green color: \(\hbox {G}=100\) if transparent to IR and \(\hbox {G}=0\) if opaque), Iron distribution (Red color: \(\hbox {R}=100\) if Fe signal is maximum and \(\hbox {R}=0\) if Fe is minimum) and Manganese distribution (Blue color: \(\hbox {B}=100\) if Mn signal is maximum and \(\hbox {B}=0\) if Mn is minimum)