In 2019 Yale University, with the support of the Getty Foundation, held an international conference, where nearly four hundred attendees from more than twenty countries gathered to discuss a vital topic: how best to conserve paintings on canvas. It was the first major symposium on the subject since 1974, when wax-resin and glue-paste lining reigned as the predominant conservation techniques. Over the past fifty years, such methods, which were often destructive to artworks, have become less widely used in favor of more minimalist approaches to intervention. More recent decades have witnessed...