Sturla J. Gudlaugsson, Geraert ter Borch, 2 vols. (The Hague, 1959–60), 2:166, 177–78 and 181, nos. 158, 175, and 182 respectively.
Alison McNeil Kettering, “Gerard ter Borch’s Portraits of the Deventer Elite,” Simiolis 27 (1999): 58.
Sturla J. Gudlaugsson, Geraert ter Borch, 2 vols. (The Hague, 1959–60), 2:167, 168.
X-rays were taken in 2012 by Jean Neeman and digitized by Yosi Poseilov, both of the Los Angeles County Museum of Art. I am grateful to Amy Walsh, curator of European paintings at LACMA, for making these images available to me.
As, for example, in the Portrait of a Man in Munich (fig. 1) and its pendant Portrait of a Woman (inv. 8129), in which the shadowy “transition” is significantly higher in the former than it is in the latter portrait.
See the technical report prepared by Annette Rupprecht, March 2012.