From: Charcoal or black stone? Reconstructions as a tool to study the behaviour of dry underdrawing materials within the paint structure of sixteenth century panel paintings
Altarpiece
Elements identified in the underdrawing particles
S. Francisco
C, Ca, S, Pb (K, Na, Mg, Si, Al)
Machede
C, Ca, S, Pb (K, Fe, Si, Al)
Sousel
C, Ca, S, Pb (Na, Mg, Si, Al)