Photomicrograph under plane-polarized transmitted light of a thin section of a casting core. Francesco Primaticcio (Italian, 1504–1570), Laocoön and His Sons, 1542, H. 191 cm (Musée national du château de Fontainebleau, France, inv. MR 3290). See Castelle, Manon, Yvan Coquinot, and David Bourgarit. 2016. “Casting Cores of French Bronze Statues of the 16th and 17th Centuries: Identification of Regional Practices and Artistic Choices.” Microchemical Journal 126:121–31..