Uncovering hidden jewels: an investigation of the pictorial layers of an 18th-century Taskin harpsichord

Cortea, Ioana Maria; Ghervase, Luminița; Ratoiu, Lucian; Dinu, Monica; Rădvan, Roxana

doi:10.1186/s40494-020-00401-3

Heritage Science

Table 1 Synthetic results of the physico-chemical analysis obtained on the investigated samples

From: Uncovering hidden jewels: an investigation of the pictorial layers of an 18th-century Taskin harpsichord

Sample	Description (location, typology, size)	Micro details	XRF detected elements^a	FTIR identification
S1	Keywell, gold foil, 2.60 × 2.25 × 0.25 μm	Painting Ground	Zn, Pb, Fe, Au, Ca, Cu, Ba, Sr, Mn, Cr	Lead white, shellac, Prussian blue, ochre (kaolinite, quartz, iron oxides), gypsum, barium sulfate, metal soaps, oil/protein binder
S1	Keywell, gold foil, 2.60 × 2.25 × 0.25 μm	Painting Ground	Pb, Fe, Bi, Cu, Mn, Ti, Zn, Ca, Sr	Lead white, lipids, proteinaceous materials (?)
S2	Stands, green, 1.70 × 1.85 × 0.20 μm	Painting Ground	Pb, Fe, Ca, Cu, Co, Ti/Ba, Mn, Zn, Bi, Sr, Cr, Si, Al	Lead white, ochre (kaolinite, quartz, iron oxides), gypsum, oil/protein binder
S2	Stands, green, 1.70 × 1.85 × 0.20 μm	Painting Ground	Ca, Pb, Fe, Cu, Mn, Zn, Ti, Co, Sr, Hg, Cr, Si, Bi	Lead white, gypsum, chalk, umber (magnesium oxide, iron oxide, kaolinite, quartz), lipids, proteinaceous materials
S3	Border, green, 3.30 × 2.56 × 0.27 μm	Painting Ground	Zn, Pb, Fe, Sr, Ba, Cu, Ca	Lead white, Prussian blue, ochre (kaolinite, quartz, iron oxides), metal soaps, oil/protein binder
S3	Border, green, 3.30 × 2.56 × 0.27 μm	Painting Ground	Pb, Fe, Bi, Cu, Zn, Ba, Ca, Hg	Lead white, lipids, proteinaceous materials (?)
S4	Tail, green, 1.33 × 1.53 × 0.25 μm	Painting Ground	Pb, Zn, Cu, Fe, Ba, Ca	Lead white, gypsum, Prussian blue, ochre (kaolinite, quartz, iron oxides), metal soaps, oil/protein binder
S4	Tail, green, 1.33 × 1.53 × 0.25 μm	Painting Ground	Ca, Pb, Fe, Cu, Zn, Ti	Chalk, proteinaceous materials
S5	Bentside, blue-green, 1.27 × 1.20 × 0.56 μm	Painting Ground	Zn, Pb, Fe, Ca, Cu, Ba, Mn, Sr, Bi, Hg	Lead white, shellac, Prussian blue, emerald green (?), ochre (kaolinite, quartz, iron oxides), barium sulfate, metal soaps, oil/protein binder
S5	Bentside, blue-green, 1.27 × 1.20 × 0.56 μm	Painting Ground	Pb, Ca, Zn, Fe, Cu, Ba, Si, S	Chalk, lead white, lipids, proteinaceous materials
S6	Keywell, gold foil, 2.87 × 1.40 × 0.56 μm	Painting Ground	Pb, Cu, Ca, Au, Fe, Zn, Mn, Ti	Lead white, shellac, ochre (kaolinite, quartz, iron oxides), metal soaps, oil/protein binder
S6	Keywell, gold foil, 2.87 × 1.40 × 0.56 μm	Painting Ground	Ca, Pb, Cu, Fe, Ti, Sr, Mn, Au	Chalk, lead white, lipids, proteinaceous materials
S7	Keywell, red, 1.02 × 0.66 × 0.36 μm	Painting Ground	Ca, Pb, Cu, Fe, Zn, Ti, Hg, Mn, Cr, Sr	Lead white, red lead (?), shellac, ochre (quartz, iron oxides), barium sulfate, metal soaps, oil/protein binder
S7	Keywell, red, 1.02 × 0.66 × 0.36 μm	Painting Ground	Ca, Pb, Zn, Cu, Fe, Mn, Ti, Sr, Cr, Hg	Chalk, lead white, lipids, proteinaceous materials

^aMajor elements with bold letters, minor elements with regular letters, trace elements with italic letters

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