Visual induced luminescence method Herculaneum Project
A project of the Getty Conservation Institute

FIGURE A. Visual induced luminescence (VIL) is a non-invasive method that can identify the pigment, Egyptian blue. This method was used extensively in the Casa del Bicentenario to determine the painting technique and the extent of the use of this pigment on the wall paintings. Figure A shows a detail of one of the medallions in visible light. Photo: Giacomo Chiari