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

SS.SEPULCHRE IN JERUSALEM

BAS-RELIEFS ON THE ARCHITRAVE OF THE SS.SEPULCHRE IN JERUSALEM AUTHORITY RESPONSIBLE OF THE RESTORATION: Israeli Antiquity Authority; RESTORER: Ja'cof Shaffer Director Conservation Department; Jack Neuger Head art Conservator sector

AUTHORITY RESPONSIBLE OF THE RESTORATION: Israeli Antiquity Authority;

RESTORER: Ja'cof Shaffer Director Conservation Department; Jack Neuger Head art Conservator sector

Scientific consultancy and chemical analyses: Istituto Centrale per il Restauro di Roma(Central Restoration Institute

History: this involves two marble slabs from Asia Minor, reused during the era of the crusades for decorating the architraves of the Holy Sepulchre. Though the workshop where they were created is uncertain, they were probably crafted by a group of French and Palestine masters sometime around the year 1160. The first depicts a scene from the life of Christ, the second, allegories of the capital sins and virtues. In 1348 a document mentions that the bas-reliefs still had a natural marble colour which therefore dates the probable conservation operations that gave rise to the thick brown oxalate patina to a later period - though nobody knows exactly when.


After the earthquake in 1927 and the consequent loss of fragments, they were transported to the Rockfeller Museum, where over the next decades they were subjected to various restoration attempts, logically limited because of the scarce possibilities and knowledge of the restorers at that time.
The extremely precarious condition of the bas-reliefs, with extensive and ingrained deterioration of the marble support mean that the restoration works can no longer be postponed. They are also necessary as the carrying out of copies of the bas-reliefs has been programmed via no-contact scanning in view of a future remounting of the same on the portals. 

LASER CLEANING METHOD:

Within the framework of the restoration works of the bas-reliefs of the portals of the Holy Sepulchre of Jerusalem, El.En. S.p.A. has provided the Israel Antiquity Authorities with a laser to be used in the operations for cleaning the bas-reliefs of the horizons of deterioration and substances used in previous restoration works. The conservation and cleaning operations are carried out in part with traditional mechanical methods, while laser is used mainly on the points where the original modelling has been lost, therefore making it extremely difficult to operate with traditional methods without causing the detaching of additional marble crystals. This method also allows for intervening before consolidation with chemical products.