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Fig. 2 | Heritage Science

Fig. 2

From: Alexander Calder’s Half-Circle, Quarter-Circle, and Sphere (1932): a complex history of repainting unraveled

Fig. 2

FTIR and Raman spectra of sample S7 (likely original white). a FTIR spectrum of sample S7, i.e. single-layered white paint removed from the interior of the artwork’s wooden base on the proper right. b Raman spectrum (λexc = 785 nm) of the same sample. Materials identified in the spectra include barite and/or lithopone (1183, 1118, 1079, 985, 638, 610 cm−1 FTIR; 348, 452, 461, 617, 645, 988 cm−1 Raman), calcite (2516, 1798, 1421, 878, 714 cm−1 FTIR; 280, 1086 cm−1 Raman), gypsum (3507, 3405, 670 cm−1 FTIR; 1008 cm−1 Raman), zinc white (435 cm−1 Raman), calcium oxalates (1322 cm−1 FTIR), zinc and other metal carboxylates (2920, 2850, 1585, 1543, 1457, 1400 cm−1 FTIR), and an organic medium (2920, 2850, 1741 cm−1 FTIR)

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