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

ROYAL PALACE - PATAN - NEPAL

CLEANING OF THE PORTALS OF THE ROYAL PALACE IN PATAN, NEPAL

The Patan Royal Palace's preservation at Lalitpur in Nepal, a UNESCO World Heritage building, is currently being carried out by the Institute for Conservation of Vienna in collaboration with the Kathmandu Valley Preservation Trust.

Some preliminary scientific investigations were carried out for the petrographic characterization of the red stone of the north and south portals and for the analysis of the black layer that covered them, ie bitumen intentionally laid in decades past for "conservative" purposes.

During a previous intervention, the use of solvents (acetone and white spirit) followed by mechanical scalpel action had been able to only partially remove this thick black layer.

The use of sandblasting with which some clean-up tests have been carried out has been discarded due to the fragility of the stone and the consequent loss of material as well as for reasons related to the humid climate in Nepal that would have had an impact on the Sand from the horns.

 

 


After some preliminary tests carried out at El.En. S.p.A. On some samples from the Palace, it was chosen to proceed with laser cleaning, and in particular with EOS 1000LQS and THUNDER ART laser systems that have proven to be the most effective in removing bitumen from the stone of the portals.

Both portals were cleaned using laser ablation only.