Characterisation of preparation layers in nine Danish Golden Age canvas paintings by SEM–EDX, FTIR and GC–MS

Andersen, C. K.; Bonaduce, I.; Andreotti, A.; van Lanschot, J.; Vila, A.

doi:10.1186/s40494-017-0147-0

Heritage Science

Table 3 Absorption features in the region between 4000 and 600 cm⁻¹ and their assignments in the FTIR-ATR spectra of the samples collected from the ground samples

From: Characterisation of preparation layers in nine Danish Golden Age canvas paintings by SEM–EDX, FTIR and GC–MS

No.	SMK accession no.	Lipids	Proteins	Calcium sulphate and/or other compounds	Calcium carbonate	Lead carbonate (basic)
1	KMS3262	2921 s 2852 s 1720 sh	1638 s 1530 s 1327 sh 1240 w 1208 w 1151 w 1078 sh 1030 sh	ca. 1100 br	2515 sh 1795 w 1384 s br 875 vs 715 s	3536 sh 1400 s br 1045 s 756 br 680 s 838 s (neutral)
2	KMS3004	2921 m 2852 m 1708 w	1638 m 1530 vw 1151 w	Silicate ca. 1000 s br	2515 sh 1795 w 1391 s br 875 vs 715 s	1400 s br 756 br 680 s
3	KMS1072	2921 s 2852 s 1738 + 1715 sh	1638 s 1530 s 1327 sh	3530 w 3403 w 1622 w 1110 s br	1393 s br 875 vs 715 s	3536 sh 1400 s br 1045 s 756 br 680 s
4	KMS1623 Top layer	2921 s 2852 s 1730 sh				1400 s br 1045 s (+Pb carboxylates ca. 1515 cm⁻¹)
4	KMS1623 Bottom layer	2921 s 2852 s 1730 sh	1638 br 1537 br	Silicate ca. 1000 s br	1393 w br (carbonate)
5	KMS1671	2921 s 2852 s 1720 sh	1638 s 1530 s 1327 sh 1240 w 1208 w 1151 w 1078 sh 1030 sh	ca. 1100 br	2515 sh 1795 w 1384 s br 875 vs 715 s	3536 sh 1400 s br 1045 s 756 br 680 s 838 s (neutral)
6	KMS608	2921 s 2852 s 1710 sh	1638 s 1530 s 1151 w 1030 sh	ca. 1100 s br ca. 673 w	2515 sh 1795 w 1384 s br 875 vs 715 s	3534 1400 s br 680 s 838 s w (neutral)
7	KMS6177	2921 s 2852 s 1738 sh 1715 sh	1638 s 1530 s 1327 sh 1240 w 1078 sh 1030 sh	3530 w 3403 w 1110 s br 673 s	1393 s br 875 vs 715 s	1400 s br 680 s
8	KMS1081	2921 s 2852 s 1720 m	1638 m 1530 m 1327 sh 1240 w 1208 w 1151 w 1078 sh 1030 sh	1620 br (w?) 1110 s (w?) 673 s (w?)	2515 sh 1795 w 1384 s br 875 vs 715 s	3536 sh 1400 s br 1045 s 756 br 680 s
9	KMS1644 Top layer	2921 s 2852 s 1730 sh		BaSO₄ with bands ca. 1170, 1112, 1075, 981 s		1400 s br 1045 s (+Pb carboxylates ca. 1515 cm⁻¹)
10	KMS1644 Bottom layer	2921 s 2852 s 1738, 1710 sh 1169 w 1094 w			2515 sh 1795 w 1389 s br 875 vs 715 s

Regarding basic lead carbonate, it is only possible to identify the main components due to the overlap of calcium carbonate, lead carbonate and calcium sulphate peaks. Lead carboxylates could also be present, with bands approximately 1500 and 1400 cm⁻¹; however, because the peaks are located on the same wavelengths as proteinaceous compounds and carbonates, they cannot always be identified
s sharp peak, m medium peak, w weak peak, br broad band, v very, sh shoulder band

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