Table 1 A summary of the results obtained from the scientific analysis of the four paintings under study

Iberia #25 (1948)

S1) Scraping of black paint

Py-GC/MS

n-BMA, linseed oil, Pinaceae resin

S2) Scraping of black paint

Py-GC/MS

Oil (possibly linseed) with increased azelaic acid, Pinaceae resin, trace n-BMA

S3) Cross section of black paint

Optical microscopy, SEM/EDS, Raman

Titanium white (rutile), anhydrite, talc

Cerulean blue, Prussian blue, bone or ivory black, cadmium sulfoselenide

S4) Scraping of red paint

Py-GC/MS

Oil with increased palmitic acid or decreased azelaic acid, unsaturated fatty acids, phthalic acid di(3-ethylphenyl)ester, Pinaceae resin

S5) Scraping of pink wash

Py-GC/MS

Oil (possibly linseed) with increased azelaic acid, unsaturated fatty acids, Pinaceae resin

S6) Cross section of red paint

Optical microscopy, SEM/EDS, Raman, SERS

Titanium white (rutile), anhydrite, talc

Prussian blue, cerulean blue, bone or ivory black, cadmium sulfoselenide, purpurin lake, calcium sulfate, barite, zinc white

S7) Scraping of red paint

Py-GC/MS

Oil (possibly linseed) with increased azelaic acid, Pinaceae resin

S8) Cross section of orange paint

Optical microscopy, SEM/EDS, Raman, SERS

Titanium white (rutile), anhydrite, talc

Prussian blue, bone or ivory black, cadmium sulfoselenide, cadmium yellow, purpurin lake, alumina, calcium carbonate

S9) Scraping of orange paint

Py-GC/MS

n-BMA, oil (possibly linseed) with decreased azelaic acid, unsaturated fatty acids, Pinaceae resin

Iberic (1949)

S1) Scraping of black paint

Py-GC/MS, FTIR

n-BMA, oil, Pinaceae resin, trace phthalic anhydride, phthalates, and styrene

S2) Scraping of orange paint

Py-GC/MS, FTIR

n-BMA, oil, Pinaceae resin, trace phthalic anhydride, phthalates, and styrene

S3) Scraping of red paint

Py-GC/MS, FTIR

n-BMA, oil, Pinaceae resin, trace phthalic anhydride, phthalates, and styrene

S4) Cross section of black paint

Optical microscopy, SEM/EDS, Raman

Titanium white (rutile), anhydrite, talc

Bone or ivory black, cadmium yellow, Cd- and Se-containing red particles

S5) Cross section of red paint

Optical microscopy, SEM/EDS, Raman

Titanium white (rutile), anhydrite, talc

Bone or ivory black, cadmium sulfoselenide, barite

S6) Cross section of orange paint

Optical microscopy, SEM/EDS, Raman

Titanium white (rutile), anhydrite, talc

Bone or ivory black particles, cadmium sulfoselenide

S7) Cross section of red paint

Optical microscopy, SEM/EDS, Raman

Titanium white (rutile), anhydrite, talc

Cadmium sulfoselenide

S8) Cross section of gray wash

Optical microscopy, SEM/EDS, Raman

Titanium white (rutile), anhydrite, talc

S9) Cross section of orange paint

Optical microscopy, SEM/EDS, Raman

Titanium white (rutile), anhydrite, talc

Cadmium sulfoselenide, traces of black layer

S10) Cross section of orange paint

Optical microscopy, SEM/EDS, Raman

Titanium white (rutile), anhydrite, talc

Cadmium sulfoselenide

S11) Cross section of gray paint

Optical microscopy, SEM/EDS, Raman

Titanium white (rutile), anhydrite, talc

S12) Scraping of coating on top of black paint

Py-GC/MS, FTIR

Oil with increased azelaic acid, n-BMA, phthalic acid, trace Pinaceae resin and styrene

S13) Scraping of gummy accretions on surface

Py-GC/MS, FTIR

2-ethylhexyl acrylate polymer

S14) Scraping of coating on top of red paint

Py-GC/MS

n-BMA, various other acrylics, drying oil, trace Pinaceae resin

S15) Scraping of coating on top of orange paint

Py-GC/MS

n-BMA, various other acrylics, drying oil, trace Pinaceae resin

S16) Scraping of coating on top of orange paint

Py-GC/MS

n-BMA, various other acrylics, drying oil, trace Pinaceae resin

S17) Cross section of red paint

Optical microscopy

S18) Scraping of coating on top of red paint

Py-GC/MS

n-BMA, various other acrylics, drying oil, trace Pinaceae resin

Flights of Colors #16 (1949)

S1) Scraping of pink paint

Py-GC/MS

Oil (possibly walnut, linseed mixed with poppy, or linseed with increased palmitic acid), unsaturated fatty acids, Pinaceae resin

S2) Cross section of pink paint

Optical microscopy, SEM/EDS, Raman, SERS

Titanium white (rutile), anhydrite, talc

Yellow ocher, cadmium yellow, viridian, purpurin lake, zinc white

S3) Scraping of orange paint

Py-GC/MS

Oil (possibly walnut, linseed mixed with poppy, or linseed with increased palmitic acid), Pinaceae resin, trace n-BMA

S4) Cross section of orange paint

Optical microscopy, SEM/EDS, Raman, SERS

Titanium white (rutile), anhydrite, talc

Iron(III) oxide, purpurin lake, cadmium red, cadmium orange, cadmium yellow, barite

S5) Scraping of brown paint

Py-GC/MS

Oil (possibly walnut or linseed mixed with poppy), unsaturated fatty acids

S6) Cross section of brown paint

Optical microscopy, SEM/EDS, Raman

Titanium white (rutile), anhydrite, talc

Cadmium red, iron(III) oxide, yellow ocher, viridian, bone or ivory black, zinc white, cobalt blue, Prussian blue

Early Dynasty (1953)

S1) Scraping of blue paint

Py-GC/MS

Oil (possibly linseed) with increased azelaic acid, Pinaceae resin

S2) Cross section of blue paint

Optical microscopy, SEM/EDS, Raman

Titanium white (rutile), anhydrite, talc

Cobalt blue, Prussian blue, cerulean blue

S3) Scraping of blue paint

Py-GC/MS

Oil (possibly linseed) with increased azelaic acid, Pinaceae resin

S4) Cross section of blue paint

Optical microscopy, SEM/EDS, Raman

Titanium white (rutile), anhydrite, talc

Cobalt blue, Prussian blue, cerulean blue

S5) Cross section of blue paint

Optical microscopy, SEM/EDS, Raman

Titanium white (rutile), anhydrite, talc

Cobalt blue, Prussian blue, cerulean blue

S6) Cross section of blue paint

Optical microscopy, SEM/EDS, Raman

Titanium white (rutile), anhydrite, talc

Cobalt blue, Prussian blue, cerulean blue, ultramarine blue

S7) Scraping of blue paint

Py-GC/MS

S8) Scraping of red paint

Py-GC/MS

Oil with increased palmitic acid

S9) Cross section of red paint

Optical microscopy, SEM/EDS, Raman

Titanium white (rutile), anhydrite, talc

Cadmium sulfoselenide