field testing grouts at Herculaneum Injection Grouts for the Conservation of Architectural Surfaces: Research and Evaluation
A project of the Getty Conservation Institute

Conservators and scientists from the GCI and the Herculaneum Conservation Project carrying out field testing of laser speckle interferometry—a nondestructive technique to detect voids behind the surface of wall paintings—at the archaeological site of Herculaneum. Photo: Giacomo Chiari.