Application of a new laser cleaning procedure to the mausoleum of Theodoric |
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| Institution: | 1. University Hospital of Saarland, Medical School, Germany;2. University Children''s Hospital of Saarland, Department of Pediatric Cardiology, Germany;3. University Children''s Hospital of Saarland, Department of Pediatrics and Neonatology, Germany;4. University Children''s Hospital of Saarland, Department of Pediatrics, Germany;5. University Hospital of Saarland, Institute of Medical Biometry, Epidemiology, and Medical Informatics, Germany;6. University Hospital of Saarland, Clinical Chemistry and Laboratory Diagnostics, Germany;7. University Hospital of Saarland, Department of Clinical Hemostaseology, Germany |
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| Abstract: | Within the conservation programme of the mausoleum of Theodoric, located in Ravenna, Italy, we applied a new cleaning procedure based on the use of a recently developed Nd:YAG laser system, suitably equipped in this case with long optical fibre cables for the transmission of laser radiation to work sites on the façade. The intervention of the laser technique was required to complete the cleaning of a decoration surrounding the monolithic dome, after conventional cleaning methods had been applied with unsatisfactory results. Preliminary laboratory analyses on stone samples collected from the dome and subjected to laser treatment indicated that this technique was effective and could fully preserve the lime–Ca oxalate film existing below the thick layer of black crusts. Before starting the operative phase on the mausoleum, it was necessary to solve the practical problem of keeping free access to the monument during cleaning operations, which hindered the location of the laser in close proximity to the sites to be cleaned. This was achieved by preparing long fibre cables (up to 50 m) which permitted the successful completion of the cleaning while leaving the laser body far away from the dome. |
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