Learning from the past, intervening in the present: the role of conservation science in the challenging restoration of the wall painting Marriage at Cana by Luca Longhi (Ravenna, Italy)

Heritage Science

Table 2 Samples collected from the artwork, with details of performed analyses and summary of achieved results

Sample	Colour	Analyses	Results
MC1	Pink	Cross-section analysed by SEM–EDS, µ-FTIR and µ-Raman	4—calcium oxalate 3—calcium carbonate, lead white, yellow pigment (maybe ochre), lead carboxylate. Binder: oil 2—calcium carbonate, lead white, red lead, carbon black, lead carboxylate. Binder: oil 1—acrylic resin and cellulose-based compound 0—canvas
MC2	Blue	Cross-section analysed by SEM–EDS, µ-FTIR and µRaman	7—indigo, lead white, calcium carbonate, lead carboxylate, calcium oxalate. Binder: oil 5, 6—calcium carbonate, lead white, silicates, lead carboxylates, indigo. Binder: oil 4—calcium carbonate, lead white, silicates, lead carboxylates, oil 3—red lead, vermilion, in a siliceous matrix 2—calcium carbonate, lead white, carbon black, red lead, lead carboxylates. Binder: oil 1—acrylic resin, cellulose-based compound
MC3	Restoration area	Cross-section analysed by SEM–EDS and µ-FTIR	3—calcium carbonate 2—acrylic resin and cellulose-based compound 1—calcium carbonate, animal glue, lead white
MC4	White patina	Sample treated with HCl and analysed by µ-FTIR	Acrylic resin and a cellulose based compound, small amount of protein material