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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)
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
 
  1. 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
  2. s sharp peak, m medium peak, w weak peak, br broad band, v very, sh shoulder band