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Heritage Science
Fig. 4 | Heritage Science

Fig. 4

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

Fig. 4

BSE and optical microscopy images of cross section S4 (likely overpainting whites). a BSE image of cross section S4, i.e. multi-layered white paint removed from the artwork’s exterior, on the proper right side, close to the base’s rear edge at bottom, revealing eleven layers of overpaint. b Polarized and c UV light photographs of the same cross section, displaying different white shades as well as fluorescence emission colors and intensities for the various paint layers

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