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

SANDSTONE HEAD

SANDSTONE HEAD FROM THE XIII CENTURY (40 X 30 X 15 CM)

AUTHORITY RESPONSIBLE OF THE RESTORATION: Academy of Fine Arts in Carrara

RESTORER:  Prof. Augusto Giuffredi

HISTORY: Under a first powderlike deposit, the surface of the head appeared covered with deposits of atmospheric particles.

These deposits, anchored firmly to the surface tended to desquamation in sheets and flakes, because in some parts of the work some gaps and loss of material were present.
The surface appeared detached and therefore  
a normal mechanical cleaning with scalpels, not practicable without a previous consolidation, would have caused the removal of parts of the original material compromising the status of the work.

LASER CLEANING METHODOLOGY

The laser "Palladium" by Quanta System was used on the surface with a pulse energy of 190mj and a repetition frequency of 10 Hz. Cleaning tests consisted in varying the intensity of the spot up to obtain satisfactory results. The superficial patina was preserved  without eliminating the contrast between the oldest sufaces and those recently fallen.


During the cleaning, no alterations or loss of material were detected.  A sheet of white paper was placed under the artwork to make sure that no detachment of material occurred.
The use of laser has been always very controlled and calibrated in the operational parameters.

The action of the laser on the surface was continually stopped  to check the achieved effect while preserving the original patina.