St. Stephen's Church in Vienna: criteria for Nd:YAG laser cleaning on an architectural scale |
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| Institution: | 1. Universidad de Jaén, Department of Physical and Analytical Chemistry, Campus Las Lagunillas, E-23071 Jaén, (Spain);2. Conservation Department, Council of the Alhambra and Generalife, Granada, Spain;3. Laboratory of Chemical Science for Safeguarding the Cultural Heritage, Department of Chemistry and Industrial Chemistry, University of Pisa, Via Risorgimento 35, 56126 Pisa, Italy;4. ICVBC-CNR, Via Madonna del Piano 10 - Edificio C, 50019 Sesto Fiorentino, Florence, Italy |
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| Abstract: | The hewn sandstone and ornamental figures of the Albertino Chancel, built around the mid-14th century, are covered with black encrustations of plaster and carbon deposits, often several millimetres thick. Their removal constitutes one of the main objectives in the conservation of the precious materials of the cathedral. The Nd:YAG laser method cleans the original surface of hardened encrustations without damaging or affecting the old coloured plasters and without affecting the centuries-old patina. Laser-Tech GmbH, founded by two expert restorers from Austria and Italy, is specialised in large-scale projects and, regarding the present project for the chancel, has managed to combine the sensitivity of the preserver with the laser technology applied to large surfaces. The present project concerning St. Stephen's Church comprises over 2000 m2 of stone surface treated only with laser systems, by groups of qualified restorers trained at Altech to use such instrumentation on artistic historic surfaces. |
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