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Table 1 Summary of pigments and other materials used in The Blue Room and in the hidden portrait

From: Reflectance imaging spectroscopy and synchrotron radiation X-ray fluorescence mapping used in a technical study of The Blue Room by Pablo Picasso

  The Blue Room Portrait
Groundf Lead white (2PbCO3∙Pb(OH)2)a,b,d with gypsum (CaSO4·2H2O)2 fillerb
Fillers Barium white (BaSO4)a,b,c,d; silica (quartz) (SiO2)a
Blue Prussian blue (Fe 4 [Fe(CN) 6 ] 3 ) a,b,d
Ultramarine (synth.) (Na6-10Al6Si6O24S2-4)b,e
Prussian blue (Fe 4 [Fe(CN) 6 ] 3 ) a,b,d
Black   Carbon black (C) b
Bone black (C+Ca 3 (PO 4 ) 2 ) a
White Zinc white (ZnO) a,b,d Zinc white (ZnO) a,b,d
Lead white (2PbCO 3 ∙Pb(OH) 2 ) e
Green Emerald green
(3Cu(AsO2)2·Cu(CH3COO)2)a,d
Viridian (Cr2O3·2H2O)a,d,e
Compound green-chrome or cadmium yellow mixed with Prussian blue and bone black
Yellow Chrome yellow (PbCrO 4 ) a,b,c,d
Cadmium yellow (CdS)a,b,d
Chrome yellow (PbCrO 4 ) a,b,c,d
Red Vermilion (HgS)a,b,d
Other Acrylic resin varnish (from later conservation treatment)c
  1. Principal pigments are italicized. Common chemical formulas are provided for reference
  2. aSEM-EDX
  3. bµRaman
  4. cµFT-IR
  5. dXRF
  6. eRIS
  7. fCommercially prepared canvas