Research indicated that, although brightly polished when acquired (left), this sculpture was intended by the artist to have a thin brown patina. It was therefore allowed to darken by exposure to air for some years (middle). This appearance was still considered unacceptable, so repatination was deemed necessary to return it to its original appearance (right). Jean Arp (French German, 1886–1966), Human Concretion without Oval Bowl, 1933, cast 1961, H. 58.4 cm (San Francisco Museum of Modern Art, William L. Gerstle Collection, William L. Gerstle Fund purchase, inv. 62.2431). See Hamilton, Emily. 2018. “All That Glitters Is Not Gold: Repatinating the Sculpture of Jean Arp.” SFMOMA.org, March 2018. https://www.sfmoma.org/read/all-glitters-not-gold-repatinating-sculptures-jean-arp/..