TECHNOLOGICAL ANSWERS
TO RESTORATION

The growing need to preserve our cultural heritage is causing a rise in the demand for increasingly accurate cleaning techniques, featuring high selectivity and low impact.

CASI DI STUDIO

SAN COSTANZO CHURCH IN RONCIGLIONE, VITERBO, ITALY

RESTORATION OF THE WALL PAINTINGS DECORATING THE DOME

 

In the frame of the COBRA (Conservation of Cultural Heritage through Radiation and Enabling Technologies) project a multidisciplinary study has been carried out in order to restore the mural painting of the dome of the S. Costanzo church in Ronciglione (Italy). Large difficulties have been met during the restitutive restoration of the original renaissance fresco decorating the dome, patronized by the Italian Ministry of Cultural Heritage (SABAP RM MET). In fact, two and sometimes three layers of paint, which lays on an extremely crumbled substrate have been detected on the surface, in addition to large, deep and complex degradation forms with the presence of efflorescences. To solve such a critique situation, researchers, conservators and suppliers of lasers for cleaning have collaborated to plan the most appropriate intervention. Laser based diagnostics have been employed to characterize different surface areas before and after cleaning tests. 

In particular, ENEA has offered its prototypes of LIF (Laser Induced Fluorescence) and RGB-ITR (Red Green Blue Imaging Topological Radar, an innovative 3D color laser scanner) in addition to a laser Raman system and an infrared camera for thermographic measurements for both the material and degradation recognition and a micro-structural study. Their results have allowed to point at most suitable restoration and conservation strategies. The cleaning tests have been performed with both classical methods and lasers made available by El.En. group. Different operative parameters such as pulse duration, repetition rate, energy, have been tested. The laser employed has made possible to overpass the difficulties encountered by other cleaning techniques: degradation and painting layers have been removed selectively, allowing to bring to light the original surface.

ADOPTED SYSTEM